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1. general description the SC16IS741 is a slave i 2 c-bus/spi interface to a single-channel high performance uart. it offers data rates up to 5 mbit/s and guarantees low operating and sleeping current. the device comes in the tssop16 pa ckage, which makes it ideally suitable for handheld, battery operated applications. this device enables seamless protocol conversion from i 2 c-bus or spi to and rs-232/rs-485 and are fully bidirectional. the SC16IS741?s internal register set is backward-compatible with the widely used and widely popular 16c450. this allows the soft ware to be easily written or ported from another platform. the SC16IS741 also provides additional adv anced features such as auto hardware and software flow control, automatic rs-485 support, and software reset. this allows the software to reset the uart at any moment, independent of the hardware reset signal. 2. features 2.1 general features ? single full-duplex uart ? selectable i 2 c-bus or spi interface ? 3.3 v or 2.5 v operation ? industrial temperature range: ? 40 c to +95 c ? 64 bytes fifo (transmitter and receiver) ? fully compatible with industrial standard 16c450 and equivalent ? baud rates up to 5 mbit/s in 16 clock mode ? auto hardware flow control using rts /cts ? auto software flow control with programmable xon/xoff characters ? single or double xon/xoff characters ? automatic rs-485 support (automatic slave address detection) ? rs-485 driver direction control via rts signal ? rs-485 driver directio n control inversion ? built-in irda encoder and decoder interface ? software reset ? transmitter and receiver can be enabled/disabled independent of each other ? receive and transmit fifo levels ? programmable special character detection SC16IS741 single uart with i 2 c-bus/spi interface, 64 bytes of transmit and receive fifos, irda sir built-in support rev. 01 ? 29 april 2010 product data sheet
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 2 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir ? fully programmable character formatting ? 5-bit, 6-bit, 7-bit or 8-bit character ? even, odd, or no parity ? 1, 1 1 ? 2 , or 2 stop bits ? line break generation and detection ? internal loopback mode ? sleep current less than 30 a at 3.3 v ? industrial and commercial temperature ranges ? available in the tssop16 package 2.2 i 2 c-bus features ? noise filter on scl/sda inputs ? 400 kbit/s maximum speed ? compliant with i 2 c-bus fast speed ? slave mode only 2.3 spi features ? slave mode only ? spi mode 0 3. applications ? factory automation and process control ? portable and battery operated devices ? cellular data devices 4. ordering information table 1. ordering information type number package name description version SC16IS741ipw tssop16 plastic thin shrink small outline package; 16 leads; body width 4.4 mm sot403-1
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 3 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 5. block diagram fig 1. block diagram of SC16IS741 i 2 c-bus interface fig 2. block diagram of SC16IS741 spi interface SC16IS741 16c450 compatible register sets 002aaf1 55 v dd i 2 c-bus tx rx rts cts xtal1 xtal2 scl sda a0 irq i2c/spi a1 reset v dd v ss v dd 1 k (3.3 v) 1.5 k (2.5 v) cs SC16IS741 16c450 compatible register sets 002aaf157 spi tx rx rts cts xtal1 xtal2 sclk so irq i2c/spi si reset v dd v ss v dd 1 k (3.3 v) 1.5 k (2.5 v)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 4 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 6. pinning information 6.1 pinning 6.2 pin description a. i 2 c-bus interface b. spi interface fig 3. pin configuration for tssop16 SC16IS741ipw v dd xtal2 a0 xtal1 a1 reset n.c. rx scl tx sda cts irq rts i2c v ss 002aaf158 1 2 3 4 5 6 7 8 10 9 12 11 14 13 16 15 SC16IS741ipw v dd xtal2 cs xtal1 si reset so rx sclk tx v ss cts irq rts spi v ss 002aaf159 1 2 3 4 5 6 7 8 10 9 12 11 14 13 16 15 table 2. pin description symbol pin type description v dd 1 - power supply cs /a0 2 i spi chip select or i 2 c-bus device address select a0. if spi configuration is selected by i2c/spi pin, this pin is the spi chip select pin (schmitt-trigger, active low). if i 2 c-bus configuration is selected by i2c/spi pin, this pin along with a1 pin allows user to change the device?s base address. si/a1 3 i spi data input pin or i 2 c-bus device address select a1. if spi configuration is selected by i2c/spi pin, this is the spi data input pin. if i 2 c-bus configuration is selected by i2c/spi pin, this pin along with a0 pin allows user to change the device?s base address. to select the device address, please refer to ta b l e 2 8 . so 4 o spi data output pin. if spi conf iguration is selected by i2c/spi pin, this is a 3-stateable output pin. if i 2 c-bus configuration is selected by i2c/spi pin, this pin function is undefi ned and must be left as n.c. (not connected). scl/sclk 5 i i 2 c-bus or spi input clock. sda 6 i/o i 2 c-bus data input/output , open-drain if i 2 c-bus configuration is selected by i2c/spi pin. if spi configuration is selected then this pin is an undefined pin and must be connected to v ss . irq 7 o interrupt (open-drain, active low). interrupt is enabled when interrupt sources are enabled in the interrupt enable register (ier). interrupt conditions include: change of state of the input pins, receiver errors, available receiver buffer data, available transmit buffer space, or when a modem status flag is detected. an external resistor (1 k for 3.3v, 1.5k for 2.5 v) must be connected between this pin and v dd . i2c/spi 8i i 2 c-bus or spi interface select. i 2 c-bus interface is selected if this pin is at logic high. spi interface is selected if this pin is at logic low.
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 5 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir [1] see section 7.4 ? hardware reset, power-on reset (por) and software reset ? 7. functional description the uart will perform serial-to-i 2 c conversion on data characters received from peripheral devices or modems, and i 2 c-to-serial conversion on data characters transmitted by the host. the complete status the SC16IS741 uart can be read at any time during functional operation by the host. the SC16IS741 can be placed in an alternate mode (fifo mode) relieving the host of excessive software overhead by buffering received/transmitted characters. both the receiver and transmitter fifos can store up to 64 characters (including three additional bits of error status per character for the receiver fifo) and have selectable or programmable trigger levels. the SC16IS741 has selectable hardware flow co ntrol and software flow control. hardware flow control significantly re duces software overhead and increases system efficiency by automatically controlling serial data flow using the rts output and cts input signals. software flow control automati cally controls data flow by using programmable xon/xoff characters. the uart includes a programmable baud rate generator that can divide the timing reference clock input by a divisor between 1 and (2 16 ?1). v ss 9 - ground rts 10 o uart request to send (active low). a logic 0 on the rts pin indicates the transmitter has data ready and waiting to send. writing a logic 1 in the modem control register mcr[1] will set this pin to a logic 0, indicating data is available. after a reset this pin is set to a logic 1. this pin only affects the transmit and receive operations when auto rts function is enabled via the enhanced feature register (efr[6]) for hardware flow control operation. cts 11 i uart clear to send (active low ). a logic 0 (low) on the cts pin indicates the modem or data set is r eady to accept transmit data from the SC16IS741. status can be te sted by reading msr[4]. this pin only affects the transmit and receive operations when auto cts function is enabled via the enhanc ed feature register efr[7] for hardware flow control operation. tx 12 o uart transmitter output. during the local loopback mode, the tx output pin is disabled and tx data is internally connected to the uart rx input. rx 13 i uart receiver input. during the local loopback mode, the rx input pin is disabled and tx data is connected to the uart rx input internally. reset 14 i device hardware reset (active low) [1] xtal1 15 i crystal input or external clock input. functions as a crystal input or as an external clock input. a crystal can be connected between xtal1 and xtal2 to form an internal oscillator circuit (see figure 11 ). alternatively, an external clock can be connected to this pin. xtal2 16 o crystal output or clock output. (see also xtal1.) xtal2 is used as a crystal oscillator output. table 2. pin description ?continued symbol pin type description
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 6 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.1 trigger levels the SC16IS741 provides independently sele ctable and programmable trigger levels for both receiver and transmitte r interrupt generation. after reset, both transmitter and receiver fifos are disabled and so, in effect, the trigger level is the default value of one character. the selectable trigger levels are available via the fcr. the programmable trigger levels are available via the tlr. if tlr bits are cleared then selectable trigger level in fcr is used. if tlr bits are not cleared then programmable trigger level in tlr is used. 7.2 hardware flow control hardware flow control is comprised of auto cts and auto rts (see figure 4 ). auto cts and auto rts can be enabled/disabled independently by programming efr[7:6]. with auto cts , cts must be active before the uart can transmit data. auto rts only activates the rts output when there is enough room in the fifo to receive data and de-activates the rts output when the rx fifo is sufficiently full. the halt and resume trigger levels in the tcr determine the levels at which rts is activated/deactivated. if tcr bits are cleared then selectable trigger levels in fcr are used in place of tcr. if both auto cts and auto rts are enabled, when rts is connected to cts , data transmission does not occur unless the receiv er fifo has empty space. thus, overrun errors are eliminated during hardware flow control. if not enabled, overrun errors occur if the transmit data rate exceeds the receive fifo servicing latency. fig 4. autoflow control (auto rts and auto cts ) example rx fifo flow control tx fifo parallel to serial tx fifo rx fifo uart 1 uart 2 rx tx rts cts tx rx cts rts 002aab656 serial to parallel serial to parallel flow control flow control flow control parallel to serial
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 7 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.2.1 auto rts figure 5 shows rts functional timing. the receiver fifo trigger levels used in auto rts are stored in the tcr or fcr. rts is active if the rx fifo le vel is below the halt trigger level in tcr[3:0]. when the receiver fi fo halt trigger level is reached, rts is deasserted. the sending device (for example, another ua rt) may send an additional character after the trigger level is reached (assuming the sending uart has another character to send) because it may not recognize the deassertion of rts until it has begun sending the additional character. rts is automatically re asserted once the receiver fifo reaches the resume trigger level programmed via tcr[7: 4]. this re-assertion allows the sending device to resume transmission. 7.2.2 auto cts figure 6 shows cts functional timing. the transmitter circuitry checks cts before sending the next data byte. when cts is active, the transmitter sends the next byte. to stop the transmitter from sendi ng the following byte, cts must be deasserted before the middle of the last stop bit that is currently being sent. the auto cts function reduces interrupts to the host system. when flow control is enabled, cts level changes do not trigger host interrupts because the device automatically controls its own transmitter. without auto cts , the transmitter sends any data present in the transmit fifo and a receiver overrun error may result. (1) n = receiver fifo trigger level. (2) the two blocks in dashed lines cover the case w here an additional character is sent, as described in section 7.2.1 fig 5. rts functional timing start character n start character n + 1 start stop stop rx rts receive fifo read n n + 1 12 002aab040 (1) when cts is low, the transmitter k eeps sending serial data out. (2) when cts goes high before the middle of the last stop bit of the cu rrent character, the transmitter finishes sending the current character, but it does not send the next character. (3) when cts goes from high to low, the transmitter begins sending data again. fig 6. cts functional timing start bit 0 to bit 7 stop tx cts 002aab04 1 start stop bit 0 to bit 7
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 8 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.3 software flow control software flow control is enabled through the enhanced feature register and the modem control register. different combinations of software flow control can be enabled by setting different combinations of efr[3:0]. ta b l e 3 shows software flow control options. there are two other enhanced features relating to software flow control: ? xon any function (mcr[5]): receiving any character will resume operation after recognizing the xoff character. it is possib le that an xon1 character is recognized as an xon any character, which could cause an xon2 character to be written to the rx fifo. ? special character (efr[5]): incoming data is compared to xoff2. detection of the special character sets the xoff interrupt (i ir[4]) but does not ha lt transmission. the xoff interrupt is cleared by a read of the iir. the special character is transferred to the rx fifo. 7.3.1 rx when software flow control operation is e nabled, the SC16IS741 will compare incoming data with xoff1/xoff2 programmed characters (in certain cases, xoff1 and xoff2 must be received sequentially). when the correct xoff characters are received, transmission is halted after completing transmission of the cu rrent character. xoff detection also sets iir[4] (if enabled via ier[5]) and causes irq to go low. to resume transmission, an xon1/xon2 char acter must be received (in certain cases xon1 and xon2 must be received sequentially). when the correct xon characters are received, iir[4] is cleared, and the xoff interrupt disappears. table 3. software flow co ntrol options (efr[3:0]) efr[3] efr[2] efr[1] efr[0] tx, rx software flow control 0 0 x x no transmit flow control 1 0 x x transmit xon1, xoff1 0 1 x x transmit xon2, xoff2 1 1 x x transmit xon1 and xon2, xoff1 and xoff2 x x 0 0 no receive flow control x x 1 0 receiver compares xon1, xoff1 x x 0 1 receiver compares xon2, xoff2 1011transmit x on1, xoff1 receiver compares xon1 or xon2, xoff1 or xoff2 0111transmit x on2, xoff2 receiver compares xon1 or xon2, xoff1 or xoff2 1111transmit x on1 and xon2, xoff1 and xoff2 receiver compares xon1 and xon2, xoff1 and xoff2 0011no transmit flow control receiver compares xon1 and xon2, xoff1 and xoff2
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 9 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.3.2 tx xoff1/xoff2 character is transmitted when the rx fifo has passed the halt trigger level programmed in tcr[3:0] or the selectable trigger level in fcr[7:6] xon1/xoff2 character is transmitted when th e rx fifo reaches the resume trigger level programmed in tcr[7:4] or rx fifo falls bel ow the lower selectab le trigger level in fcr[7:6]. the transmission of xoff/xon(s) follows the exact same protocol as transmission of an ordinary character from the fifo. this means that even if the word length is set to be 5, 6, or 7 bits, then the 5, 6, or 7 least sign ificant bits of xoff1/xoff2 or xon1/xon2 will be transmitted. (note that the transmission of 5, 6, or 7 bits of a character is seldom done, but this functionality is inclu ded to maintain compatib ility with earlier designs.) it is assumed that software flow control and hardware flow control will never be enabled simultaneously. figure 7 shows an example of software flow control. fig 7. example of software flow control transmit fifo parallel-to-serial serial-to-parallel xon1 word xon2 word xoff1 word xoff2 word receive fifo parallel-to-serial serial-to-parallel xon1 word xon2 word xoff1 word xoff2 word uart2 uart1 002aaa229 data xoff?xon?xoff compare programmed xon-xoff characters
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 10 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.4 hardware reset, po wer-on reset (por) and software reset these three reset methods are identical and will re set the internal regist ers as indicated in ta b l e 4 . ta b l e 4 summarizes the state of register. [1] registers dll, dlh, spr, xon1, xon2, xoff1, xo ff2 are not reset by the top-level reset signal reset , por or software reset, that is, they hold their initialization values during reset. ta b l e 5 summarizes the state of registers after reset. table 4. register reset [1] register reset state interrupt enable register all bits cleared interrupt identification register bit 0 is set; all other bits cleared fifo control register all bits cleared line control register reset to 0001 1101 (0x1d) modem control register all bits cleared line status register bit 5 and bit 6 set; all other bits cleared modem status register bits 0:3 cleared; bits 4:7 input signals enhanced feature register all bits cleared receiver holding register pointer logic cleared transmitter holding register pointer logic cleared transmission control register all bits cleared. trigger level register all bits cleared. transmit fifo level reset to 0100 0000 (0x40) receive fifo level all bits cleared extra feature register all bits cleared table 5. output signals after reset signal reset state tx high rts high irq high by external pull-up
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 11 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.5 interrupts the SC16IS741 has interrupt gener ation and prioritization capa bility. the interrupt enable register (ier) enables each of the interrupts and the irq signal in response to an interrupt generation. when an interrupt is gene rated, the iir indicates that an interrupt is pending and provides the type of interrupt through iir[5:0]. ta b l e 6 summarizes the interrupt control functions. it is important to note that for the framing error, parity error, and break conditions, lsr[7] generates the interrupt. lsr[7] is set when there is an error anywhere in the rx fifo, and is cleared only when there are no more errors remaining in th e fifo. lsr[4:2] always represent the error status for the received ch aracter at the top of the rx fifo. reading the rx fifo updates lsr[4:2] to the appropriate status for the new character at the top of the fifo. if the rx fifo is empty, then lsr[4:2] are all zeros. for the xoff interrupt, if an xoff flow characte r detection caused the interrupt, the interrupt is cleared by an xon flow character detectio n. if a special character detection caused the interrupt, the interrupt is cl eared by a read of the iir. table 6. summary of interrupt control functions iir[5:0] priority level interrupt type interrupt source 00 0001 none none none 00 0110 1 receiver line status oe, fe, pe, or bi errors occur in characters in the rx fifo 00 1100 2 rx time-out stale data in rx fifo 00 0100 2 rhr interrupt receive data ready (fifo disable) or rx fifo above trigger level (fifo enable) 00 0010 3 thr interrupt transmit fifo empty (fifo disable) or tx fifo passes above trigger level (fifo enable) 00 0000 4 modem status change of state of modem input pins 01 0000 6 xoff interrupt receive xoff character(s)/ special character 10 0000 7 cts , rts rts pin or cts pin change state from active (low) to inactive (high)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 12 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.5.1 interrupt mode operation in interrupt mode (if any bit of ier[3:0] is 1) the host is informed of the status of the receiver and transmitter by an interrupt signal, irq . therefore, it is not necessary to continuously poll the line status register (lsr) to see if any interrupt needs to be serviced. figure 8 shows interrupt mode operation. 7.5.2 polled mode operation in polled mode (ier[3:0] = 0000) the status of the receiver and transmitter can be checked by polling the line status register (lsr ). this mode is an alternative to the fifo interrupt mode of operation where the status of the receiver and transmitter is automatically known by means of interrupts sent to the cpu. figure 9 shows fifo polled mode operation. fig 8. interrupt mode operation 11 11 iir ier thr rhr host irq 002aab042 read iir fig 9. fifo polled mode operation 00 00 lsr ier thr rhr host read lsr 002aab043
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 13 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 7.6 sleep mode sleep mode is an enhanced feature of the SC16IS741 uart. it is enabled when efr[4], the enhanced functions bit, is set and when ier[4] is set. sleep mode is entered when: ? the serial data input line, rx, is idle (see section 7.7 ? break and time-out conditions ? ). ? the tx fifo and tx shift register are empty. ? there are no interrupts pending except thr. remark: sleep mode will not be entered if there is data in the rx fifo. in sleep mode, the clock to the uart is st opped. since most regist ers are clocked using these clocks, the powe r consumption is greatly reduced. the uart will wake up when any change is detected on the rx line, when there is any change in the state of the modem input pins, or if data is written to the tx fifo. remark: writing to the divisor latches, dll and dlh, to set the baud clock, must not be done during sleep mode. therefore, it is adv isable to disable sleep mode using ier[4] before writing to dll or dlh. 7.7 break and time-out conditions when the uart receives a number of characters and these data are not enough to set off the receive interrupt (because they do not reach the receive trigge r level), the uart will generate a time-out interrupt instead, 4 ch aracter times after the last character is received. the time-out co unter will be reset at th e center of each stop bit received or each time the receive fifo is read. a break condition is detected when the rx pin is pulled low for a duration longer than the time it takes to send a complete charac ter plus start, stop and parity bits. a break condition can be sent by sett ing lcr[6]. when this happens the tx pin will be pulled low until lsr[6] is cleared by the software. 7.8 programmable baud rate generator the SC16IS741 uart contains a programmable baud rate generator that takes any clock input and divides it by a divisor in the range between 1 and (2 16 ? 1). an additional divide-by-4 prescaler is also available and can be selected by mcr[7], as shown in figure 10 . the output frequency of the baud rate generator is 16 times the baud rate. the formula for the divisor is given in equation 1 : (1) where: prescaler = 1, when mcr[7] is set to ?0? after reset (d ivide-by-1 clock selected) prescaler = 4, when mcr[7] is set to ?1? after reset (d ivide-by-4 clock selected). remark: the default value of prescaler after reset is divide-by-1. figure 10 shows the internal prescaler and baud rate generator circuitry. divisor xtal1 crystal input frequency prescaler ----------------------------------------------------------------------------------- ?? ?? desired baud rate 16 ----------------------------------------------------------------------------------------- =
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 14 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir dll and dlh must be written to in order to program the baud rate. dll and dlh are the least significant and most significant byte of the baud rate divisor. if dll and dlh are both zero, the uart is effectively disabl ed, as no baud clock will be generated. remark: the programmable baud rate generator is provided to select both the transmit and receive clock rates. ta b l e 7 and ta b l e 8 show the baud rate and divisor correlation for crystal with frequency 1.8432 mhz and 3.072 mhz, respectively. figure 11 shows the crystal clock circuit reference. fig 10. prescaler and baud rate generator block diagram table 7. baud rates using a 1.8432 mhz crystal desired baud rate divisor used to generate 16 clock percent error difference between desired and actual 50 2304 0 75 1536 0 110 1047 0.026 134.5 857 0.058 150 768 0 300 384 0 600 192 0 1200 96 0 1800 64 0 2000 58 0.69 2400 48 0 3600 32 0 4800 24 0 7200 16 0 9600 12 0 19200 6 0 38400 3 0 56000 2 2.86 baud rate generator logic mcr[7] = 1 mcr[7] = 0 prescaler logic (divide-by-1) internal oscillator logic 002aaa233 xtal1 xtal2 input clock prescaler logic (divide-by-4) reference clock internal baud rate clock for transmitter and receive r
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 15 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir table 8. baud rates using a 3.072 mhz crystal desired baud rate divisor used to generate 16 clock percent error difference between desired and actual 50 2304 0 75 2560 0 110 1745 0.026 134.5 1428 0.034 150 1280 0 300 640 0 600 320 0 1200 160 0 1800 107 0.312 2000 96 0 2400 80 0 3600 53 0.628 4800 40 0 7200 27 1.23 9600 20 0 19200 10 0 38400 5 0 fig 11. crystal oscillator circuit reference 002aab4 02 1.8432 mhz c1 22 pf c2 33 pf xtal1 xtal2
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 16 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8. register descriptions the programming combinations for register selection are shown in table 9 . [1] mcr[7] can only be modified when efr[4] is set. [2] accessible only when erf[4] = 1 and mcr[2] = 1, t hat is, efr[4] and mcr[2] are read/write enables. [3] accessible only when lcr[7] is logic 1. [4] accessible only when lcr is set to 1011 1111b (0xbf). table 9. register map - read/write properties register name read mode write mode rhr/thr receive holding register ( rhr) transmit holding register (thr) ier interrupt enable register (ier) interrupt enable register iir/fcr interrupt identification regist er (iir) fifo control register (fcr) lcr line control register (lcr) line control register mcr modem control register (mcr) [1] modem control register [1] lsr line status register (lsr) n/a msr modem status register (msr) n/a spr scratchpad register (spr) scratchpad register tcr transmission control register (tcr) [2] transmission control register [2] tlr trigger level register (tlr) [2] trigger level register [2] txlvl transmit fifo level register n/a rxlvl receive fifo level register n/a efcr extra features register extra features register dll divisor latch lsb (dll) [3] divisor latch lsb [3] dlh divisor latch msb (dlh) [3] divisor latch msb [3] efr enhanced feature register (efr) [4] enhanced feature register [4] xon1 xon1 word [4] xon1 word [4] xon2 xon2 word [4] xon2 word [4] xoff1 xoff1 word [4] xoff1 word [4] xoff2 xoff2 word [4] xoff2 word [4]
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 17 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64- byte fifos, irda sir table 10. SC16IS741 internal registers register address register bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w general register set [1] 0x00 rhr bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r 0x00 thr bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 w 0x01 ier cts interrupt enable [2] rts interrupt enable [2] xoff [2] sleep mode [2] modem status interrupt receive line status interrupt thr empty interrupt rx data available interrupt r/w 0x02 fcr rx trigger level (msb) rx trigger level (lsb) tx trigger level (msb) [2] tx trigger level (lsb) [2] reserved [3] tx fifo reset [4] rx fifo reset [4] fifo enable w 0x02 iir [5] fifo enable fifo enable interrupt priority bit 4 [2] interrupt priority bit 3 [2] interrupt priority bit 2 interrupt priority bit 1 interrupt priority bit 0 interrupt status r 0x03 lcr divisor latch enable set break set parity even parity parity enable stop bit word length bit 1 word length bit 0 r/w 0x04 mcr clock divisor [2] irda mode enable [2] xon any [2] loopback enable reserved [3] tcr and tlr enable [2] rts reserved [3] r/w 0x05 lsr fifo data error thr and tsr empty thr empty break interrupt framing error parity error overrun error data in receiver r 0x06 msr 0 0 0 cts 0 0 0 cts r 0x07 spr bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x06 tcr [6] bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x07 tlr [6] bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x08 txlvl bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r 0x09 rxlvl bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r 0x0d reserved [3] reserved [3] reserved [3] reserved [3] reserved [3] reserved [3] reserved [3] reserved [3] reserved [3] 0x0e uart reset reserved [3] reserved [3] reserved [3] reserved [3] uart software reset reserved [3] reserved [3] reserved [3] r/w 0x0f efcr irda mode reserved [3] auto rs-485 rts output inversion auto rs-485 rts direction control reserved [3] transmitter disable receiver disable 9-bit mode enable r/w special register set [7] 0x00 dll bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x01 dlh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 18 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64- byte fifos, irda sir [1] these registers are accessible only when lcr[7] = 0. [2] these bits in can only be modified if register bit efr[4] is enabled. [3] these bits are reserved and should be set to 0. [4] after receive fifo or transmit fifo reset (t hrough fcr[1:0]), the user must wait at least 2 t clk of xtal1 before reading or writing data to rhr and thr, respectively. [5] burst reads on the serial interface (that is, reading multiple elements on the i 2 c-bus without a stop or repeated start condition, or reading multiple elements on the spi bus without de-asserting the cs pin), should not be performed on the iir register. [6] these registers are accessible only when mcr[2] = 1 and efr[4] = 1. [7] the special register set is accessible only when lcr[7] = 1 and not 0xbf. [8] enhanced feature registers are only accessible when lcr = 0xbf. enhanced register set [8] 0x02 efr auto cts auto rts special character detect enable enhanced functions software flow control bit 3 software flow control bit 2 software flow control bit 1 software flow control bit 0 r/w 0x04 xon1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x05 xon2 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x06 xoff1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w 0x07 xoff2 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w table 10. SC16IS741 internal registers ?continued register address register bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 r/w
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 19 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.1 receive holding register (rhr) the receiver section consists of the receiv er holding register (rhr) and the receiver shift register (rsr). the rhr is actually a 64-byte fifo. the rsr receives serial data from the rx pin. the data is converted to parallel data and moved to the rhr. the receiver section is controlled by the line contro l register. if the fifo is disabled, location zero of the fifo is used to store the characters. 8.2 transmit holdin g register (thr) the transmitter section consists of the transm it holding register (thr) and the transmit shift register (tsr). the thr is actually a 64-byte fifo. the thr receives data and shifts it into the tsr, where it is converted to serial data and moved out on the tx pin. if the fifo is disabled, the fifo is still used to store the byte. characters are lost if overflow occurs. 8.3 fifo control register (fcr) this is a write-only register that is used fo r enabling the fifos, clearing the fifos, setting transmitter and receiv er trigger levels. ta b l e 11 shows fifo control register bit settings. table 11. fifo control register bits description bit symbol description 7:6 fcr[7] (msb), fcr[6] (lsb) rx trigger. sets the trigger level for the rx fifo. 00 = 8 characters 01 = 16 characters 10 = 56 characters 11 = 60 characters 5:4 fcr[5] (msb), fcr[4] (lsb) tx trigger. sets the trigger level for the tx fifo. 00 = 8 spaces 01 = 16 spaces 10 = 32 spaces 11 = 56 spaces fcr[5:4] can only be modified and enabled when efr[4] is set. this is because the transmit trigger level is regarded as an enhanced function. 3 fcr[3] reserved 2fcr[2] [1] reset tx fifo logic 0 = no fifo transmit reset (normal default condition) logic 1 = clears the contents of t he transmit fifo and resets the fifo level logic (the transmit shift register is not cleared or altered). this bit will return to a logic 0 after clearing the fifo. 1fcr[1] [1] reset rx fifo logic 0 = no fifo receive reset (normal default condition) logic 1 = clears the contents of t he receive fifo and resets the fifo level logic (the receive shift register is not cleared or altered). this bit will return to a logic 0 after clearing the fifo. 0 fcr[0] fifo enable logic 0 = disable the transmit and receive fifo (normal default condition) logic 1 = enable the transmit and receive fifo
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 20 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir [1] fifo reset requires at least two xtal1 clocks, theref ore, they cannot be reset without the presence of the xtal1 clock. 8.4 line control register (lcr) this register controls the data communication format. the word length, number of stop bits, and parity type are selected by wr iting the appropriate bits to the lcr. table 12 shows the line control register bit settings. table 12. line control register bits description bit symbol description 7 lcr[7] divisor latch enable logic 0 = divisor latch disabled (normal default condition) logic 1 = divisor latch enabled 6 lcr[6] break control bit. when enabled, the break control bit causes a break condition to be transmitted (the tx ou tput is forced to a logic 0 state). this condition exists until disabled by setting lcr[6] to a logic 0. logic 0 = no tx break conditio n (normal default condition). logic 1 = forces the transmitter output (tx) to a logic 0 to alert the communication terminal to a line break condition 5 lcr[5] set parity. lcr[5] selects the fo rced parity format (if lcr[3] = 1). logic 0 = parity is not forced (normal default condition). lcr[5] = logic 1 and lcr[4] = logic 0: parity bit is forced to a logical 1 for the transmit and receive data. lcr[5] = logic 1 and lcr[4] = logic 1: parity bit is forced to a logical 0 for the transmit and receive data. 4 lcr[4] parity type select logic 0 = odd parity is generated (if lcr[3] = 1) logic 1 = even parity is generated (if lcr[3] = 1) 3 lcr[3] parity enable logic 0 = no parity (normal default condition). logic 1 = a parity bit is generated during transmission and the receiver checks for received parity 2 lcr[2] number of stop bits. specifies the number of stop bits. 0 to 1 stop bit (word length = 5, 6, 7, 8) 1 to 1.5 stop bits (word length = 5) 1 = 2 stop bits (word length = 6, 7, 8) 1:0 lcr[1:0] word length bits 1, 0. these two bits specify the word length to be transmitted or received; see table 15 .
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 21 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir table 13. lcr[5] parity selection lcr[5] lcr[4] lcr[3] parity selection x x 0 no parity 0 0 1 odd parity 011even parity 101forced parity ?1? 111forced parity ?0? table 14. lcr[2] stop bit length lcr[2] word length (bits) stop bit length (bit times) 0 5, 6, 7, 8 1 15 1 1 ? 2 1 6, 7, 8 2 table 15. lcr[1:0] word length lcr[1] lcr[0] word length (bits) 005 016 107 118
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 22 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.5 line status register (lsr) ta b l e 1 6 shows the line status register bit settings. when the lsr is read, lsr[4:2] reflect the erro r bits (bi, fe, pe) of the character at the top of the rx fifo (next character to be read). therefore, errors in a character are identified by reading the lsr and then reading the rhr. lsr[7] is set when there is an error anywhere in the rx fifo, and is cleared only when there are no more errors remaining in the fifo. table 16. line status register bits description bit symbol description 7 lsr[7] fifo data error. logic 0 = no error (normal default condition) logic 1 = at least one parity error, framing error, or break indication is in the receiver fifo. this bit is cleared when no more errors are present in the fifo. 6 lsr[6] thr and tsr empty. this bit is the transmit empty indicator. logic 0 = transmitter hold and shift registers are not empty logic 1 = transmitter hold and shift registers are empty 5 lsr[5] thr empty. this bit is the transmit holding register empty indicator. logic 0 = transmit hold register is not empty logic 1 = transmit hold register is empty. the host can now load up to 64 characters of data into the thr if the tx fifo is enabled. 4 lsr[4] break interrupt logic 0 = no break condition (normal default condition) logic 1 = a break condition occurred and associated character is 0x00, that is, rx was low for one character time frame 3 lsr[3] framing error logic 0 = no framing error in data bei ng read from rx fifo (normal default condition). logic 1 = framing error occurred in data being read from rx fifo, that is, received data did not have a valid stop bit 2 lsr[2] parity error. logic 0 = no parity error (normal default condition) logic 1 = parity error in data being read from rx fifo 1 lsr[1] overrun error logic 0 = no overrun error (normal default condition) logic 1 = overrun error has occurred 0 lsr[0] data in receiver logic 0 = no data in receive fifo (normal default condition) logic 1 = at least one character in the rx fifo
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 23 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.6 modem control register (mcr) the mcr controls the interface with the mode, data set, or peripheral device that is emulating the modem. table 17 shows the modem control register bit settings. [1] mcr[7:5] and mcr[2] can only be modified when efr[ 4] is set, that is, efr[4] is a write enable. table 17. modem control register bits description bit symbol description 7 mcr[7] [1] clock divisor logic 0 = divide-by-1 clock input logic 1 = divide-by-4 clock input 6 mcr[6] [1] irda mode enable logic 0 = normal uart mode logic 1 = irda mode 5 mcr[5] [1] xon any logic 0 = disable xon any function logic 1 = enable xon any function 4 mcr[4] enable loopback logic 0 = normal operating mode logic 1 = enable local loopback mode (internal). in this mode the mcr[1:0] signals are looped back into msr[4:5] and the tx output is looped back to the rx input internally. 3 mcr[3] reserved 2 mcr[2] tcr and tlr enable logic 0 = disable the tcr and tlr register. logic 1 = enable the tcr and tlr register. 1 mcr[1] rts logic 0 = force rts output to inactive (high) logic 1 = force rts output to active (low). in loopback mode, controls msr[4]. if auto rts is enabled, the rts output is controlled by hardware flow control. 0 mcr[0] reserved
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 24 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.7 modem status register (msr) this 8-bit register provides information about the current state of the control lines from the modem, data set, or peripheral device to t he host. it also indicates when a control input from the modem changes state. ta b l e 1 8 shows modem status register bit settings. table 18. modem status regi ster bits description bit symbol description 7 msr[7] reserved 6 msr[6] reserved 5 msr[5] reserved 4 msr[4] cts (active high, logical 1). this bit is the complement of the cts input. 3 msr[3] reserved 2 msr[2] reserved 1 msr[1] reserved 0msr[0] cts. indicates that cts input has changed state. cleared on a read.
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 25 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.8 interrupt enable register (ier) the interrupt enable register (ier) enables each of the six types of interrupt, receiver error, rhr interrup t, thr interrupt, modem stat us, xoff received, or cts /rts change of state from low to high. the irq output signal is activated in response to interrupt generation. ta b l e 1 9 shows the interrupt enable register bit settings. [1] ier[7:4] can only be modified if efr[4] is set, that is , efr[4] is a write enable. re-enabling ier[1] will not cause a new interrupt if the thr is below the threshold. table 19. interrupt enable register bits description bit symbol description 7ier[7] [1] cts interrupt enable logic 0 = disable the cts interrupt (normal default condition) logic 1 = enable the cts interrupt 6ier[6] [1] rts interrupt enable logic 0 = disable the rts interrupt (normal default condition) logic 1 = enable the rts interrupt 5ier[5] [1] xoff interrupt logic 0 = disable the xoff inte rrupt (normal default condition) logic 1 = enable the xoff interrupt 4ier[4] [1] sleep mode logic 0 = disable sleep mode (normal default condition) logic 1 = enable sleep mode. see section 7.6 ? sleep mode ? for details. 3 ier[3] reserved 2 ier[2] receive line status interrupt logic 0 = disable the receiver line status interrupt (normal default condition) logic 1 = enable the receiver line status interrupt 1 ier[1] transmit holding register interrupt. logic 0 = disable the thr interr upt (normal default condition) logic 1 = enable the thr interrupt 0 ier[0] receive holding register interrupt. logic 0 = disable the rhr interrupt (normal default condition) logic 1 = enable the rhr interrupt
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 26 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.9 interrupt identification register (iir) the iir is a read-only 8-bit register which provides the source of the interrupt in a prioritized manner. ta b l e 2 0 shows interrupt identificat ion register bit settings. table 20. interrupt identification register bits description bit symbol description 7:6 iir[7:6] mirror the contents of fcr[0] 5:1 iir[5:1] 5-bit encoded interrupt. see ta b l e 2 1 . 0 iir[0] interrupt status logic 0 = an interrupt is pending logic 1 = no interrupt is pending table 21. interrupt source priority level iir[5] iir[4] iir[3] iir[2] iir[1] iir[0] source of the interrupt 1 0 0 0 1 1 0 receiver line status error 2 0 0 1 1 0 0 receiver time-out interrupt 2 0 0 0 1 0 0 rhr interrupt 3 000010thr interrupt 4 000000modem interrupt 6 0 1 0 0 0 0 received xoff signal/ special character 7 100000cts , rts change of state from active (low) to inactive (high)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 27 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.10 enhanced features register (efr) this 8-bit register enables or disabl es the enhanced feat ures of the uart. ta b l e 2 2 shows the enhanced feature register bit settings. 8.11 division registers (dll, dlh) these are two 8-bit registers which store the 16- bit divisor for generation of the baud clock in the baud rate generator. dlh stores the most significant part of the divisor. dll stores the least significant part of the divisor. remark: dll and dlh can only be written to bef ore sleep mode is enabled, that is, before ier[4] is set. table 22. enhanced features register bits description bit symbol description 7efr[7]cts flow control enable logic 0 = cts flow control is disabled (normal default condition) logic 1 = cts flow control is enabled. transmission will stop when a high signal is detected on the cts pin. 6efr[6]rts flow control enable. logic 0 = rts flow control is disabled (normal default condition) logic 1 = rts flow control is enabled. the rts pin goes high when the receiver fifo halt trigger level tcr[3:0] is re ached, and goes low when the receiver fifo resume transmission trigger level tcr[7:4] is reached. 5 efr[5] special character detect logic 0 = special character detect disabled (normal default condition) logic 1 = special character detect enabled. received data is compared with xoff2 data. if a match occurs, the received data is transferred to fifo and iir[4] is set to a logical 1 to indica te a special character has been detected. 4 efr[4] enhanced functions enable bit logic 0 = disables enhanced functions and writing to ier[7:4], fcr[5:4], mcr[7:5]. logic 1 = enables the enhanced function ier[7:4], fcr[5:4] , and mcr[7:5] so that they can be modified. 3:0 efr[3:0] combinations of software flow co ntrol can be selected by programming these bits. see table 3 ? software flow control options (efr[3:0]) ? .
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 28 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.12 transmission control register (tcr) this 8-bit register is used to store the rx fifo threshold levels to stop/start transmission during hardware/software flow control. ta b l e 2 3 shows transmission control register bit settings. tcr trigger levels are available from 0 to 60 characters with a granularity of four. remark: tcr can only be written to when efr[4] = 1 and mcr[2] = 1. the programmer must program the tcr such that tcr[3:0] > tcr[7:4]. there is no built-in hardware check to make sure th is condition is met. also, the tc r must be programmed with this condition before auto rts or software flow control is ena bled to avoid spurious operation of the device. 8.13 trigger level register (tlr) this 8-bit register is used to store the trans mit and received fifo trigger levels used for interrupt generation. trigger levels from 4 to 60 can be programmed with a granularity of 4. ta b l e 2 4 shows trigger level register bit settings. remark: tlr can only be written to when efr[4] = 1 and mcr[2] = 1. if tlr[3:0] or tlr[7:4] are logical 0, the selectable trigger levels via the fifo control register (fcr) are used for the transmit and receive fifo trig ger levels. trig ger levels from 4 characters to 60 characters are available with a granularity of four. the tlr should be programmed for n ? 4 , where n is the desired trigger level. when the trigger level setting in tlr is zero, the SC16IS741 uses the trigger level setting defined in fcr. if tlr has non- zero trigger level value, the tr igger level defined in fcr is discarded. this applies to both transmit fifo and receive fifo trigger level setting. when tlr is used for rx trigger level control, fcr[7:6] should be left at the default state, that is, ?00?. 8.14 transmitter fifo level register (txlvl) this register is a read-only register, it re ports the number of spaces available in the transmit fifo. table 23. transmission control register bits description bit symbol description 7:4 tcr[7:4] rx fifo trigger level to resume 3:0 tcr[3:0] rx fifo trigger level to halt transmission table 24. trigger level register bits description bit symbol description 7:4 tlr[7:4] rx fifo trigger levels (4 to 60), number of characters available. 3:0 tlr[3:0] tx fifo trigger levels (4 to 60), number of spaces available. table 25. transmitter fifo level register bits description bit symbol description 7 - not used; set to zeros 6:0 txlvl[6:0] number of spaces available in tx fifo, from 0 (0x00) to 64 (0x40)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 29 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 8.15 receiver fifo l evel register (rxlvl) this register is a read-only register, it reports the fill level of the re ceive fifo. that is, the number of characters in the rx fifo. 8.16 extra features co ntrol register (efcr) table 26. receiver fifo level register bits description bit symbol description 7 - not used; set to zeros 6:0 rxlvl[6:0] number of char acters stored in rx fifo, from 0 (0x00) to 64 (0x40) table 27. extra features control register bits description bit symbol description 7 irda mode irda mode 0 = irda sir, 3 ? 16 pulse ratio, data rate up to 115.2 kbit/s 6- reserved 5 rtsinver invert rts signal in rs-485 mode 0: rts = 0 during transmission and rts = 1 during reception 1: rts = 1 during transmission and rts = 0 during reception 4 rtscon enable the transmitter to control the rts pin 0 = transmitter does not control rts pin 1 = transmitter controls rts pin 3- reserved 2 txdisable disable transmitter. uart doe s not send serial data out on the transmit pin, but the transmit fifo will continue to receive data from host until full. any data in th e tsr will be sent out before the transmitter goes into disable state. 0: transmitter is enabled 1: transmitter is disabled 1 rxdisable disable receiver. uart will stop receiving data immediately once this bit set to a 1, and any data in the tsr will be sent to the receive fifo. user is advised not to set this bit during receiving. 0: receiver is enabled 1: receiver is disabled 0 9-bit mode enable 9-bit or multidrop mode (rs-485). 0: normal rs-232 mode 1: enables rs-485 mode
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 30 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 9. rs-485 features 9.1 auto rs-485 rts control normally the rts pin is controlled by mcr bit 1, or if hardware flow control is enabled, the logic state of the rts pin is controlled by the hardware flow control circuitry. efcr register bit 4 will take the precedence over the other two modes; once this bit is set, the transmitter will control the state of the rts pin. the transmitter automatically asserts the rts pin (logic 0) once the host writes data to the transmit fifo, and deasserts rts pin (logic 1) once the last bit of the data has been transmitted. to use the auto rs-485 rts mode the software would have to disable the hardware flow control function. 9.2 rs-485 rts output inversion efcr bit 5 reverses the polarity of the rts pin if the uart is in auto rs-485 rts mode. when the transmitter has data to be sent it will deasserts the rts pin (logic 1), and when the last bit of the data has been sent out the transmitter asserts the rts pin (logic 0). 9.3 auto rs-485 efcr bit 0 is used to enable the rs-485 mode (multidrop or 9-bit mode). in this mode of operation, a ?master? station transmits an address character followed by data characters for the addressed ?slave? stations. the slav e stations examine the received data and interrupt the controller if the received char acter is an address character (parity bit = 1). to use the auto rs-485 mode the software would have to disable the hardware and software flow control functions. 9.3.1 normal multidrop mode the 9-bit mode in efcr (bit 0) is enabled, but not special character detect (efr bit 5). the receiver is set to force parity 0 (lcr[5:3] = 111) in order to detect address bytes. with the receiver initially di sabled, it ignores all the data bytes (parity bit = 0) until an address byte is received (parity bit = 1). this address byte will cause the uart to set the parity error. the uart will gene rate a line status inte rrupt (ier bit 2 must be set to ?1? at this time), and at the same time puts this address byte in the rx fifo. after the controller examines the byte it must make a decision w hether or not to enable the receiver; it should enable the receiver if the address byte addresses its id address, and must not enable the receiver if the address byte does not address its id address. if the controller enables the receiver, the re ceiver will receive the subsequent data until being disabled by the controller after the controller has received a complete message from the ?master? station. if the controller d oes not disable the receiver after receiving a message from the ?master? statio n, the receiver will generate a parity error upon receiving another address byte. the controller then determ ines if the address byte addresses its id address, if it is not, the controller then can disable the receiver. if the address byte addresses the ?slave? id address, the controlle r take no further acti on, the receiver will receive the subsequent data.
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 31 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 9.3.2 auto address detection if special character detect is enabled (efr[5] is set and the xoff2 register contains the address byte) the receiver will try to detect an address byte that matches the programmed character in the xoff2 register. if the received byte is a data byte or an address byte that does not match the pr ogrammed character in the xoff2 re gister, the receiver will discard these data. upon receiving an address byte that matches the xoff2 character, the receiver will be automatically enabled if not already enabled, and t he address charac ter is pushed into the rx fifo along with the parity bit (in pl ace of the parity error bit). the receiver also generates a line status in terrupt (ier[2] mu st be set to ?1? at this time). the receiver will then receive the subsequent data from the ?m aster? station until being disabled by the controller after having received a message from the ?master? station. if another address byte is received and this address byte does not match xoff2 character, the receiver will be automatically disabled and the address byte is ignored. if the address byte matches xoff2 character, the receiver will put this byte in the rx fifo along with the parity bit in the parity error bit (lsr bit 2). 10. i 2 c-bus operation the two lines of the i 2 c-bus are a serial data line (sda) and a serial clock line (scl). both lines are connected to a positive supply via a pull-up resistor, and remain high when the bus is not busy. each device is recognized by a unique address whether it is a microcomputer, lcd driver, memory or keyboa rd interface and can operate as either a transmitter or receiver, depending on the function of the device. a device generating a message or data is a transmitter, and a device receiving the message or data is a receiver. obviously, a passive function like an lcd driver could only be a receiver, while a microcontroller or a memory can both transmit and receive data. 10.1 data transfers one data bit is transferred during each clock pulse (see figure 12 ). the data on the sda line must remain stable during the high period of the clock pulse in order to be valid. changes in the data line at this time will be interpreted as control signals. a high-to-low transition of the data line (sda) while the clock signal (scl) is high indicates a start condition, and a low-to-high transition of the sda while scl is high defines a stop condition (see figure 13 ). the bus is considered to be busy after the start condition and free again at a certain time interval after the stop condition. the start and stop conditions are always generated by the master. fig 12. bit transfer on the i 2 c-bus mba607 data line stable; data valid change of data allowed sda scl
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 32 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir the number of data bytes transferred between the start and stop condition from transmitter to receiver is not limited. each byte, which must be eight bits long, is transferred serially with the most significant bi t first, and is followed by an acknowledge bit (see figure 14 ). the clock pulse related to the acknowledge bit is generated by the master. the device that acknowledges has to pull down the sda line during the acknowledge clock pulse, while the transmi tting device releases this pulse (see figure 15 ). a slave receiver must generate an acknowledg e after the reception of each byte, and a master must generate one after the recept ion of each byte clocked out of the slave transmitter. fig 13. start and stop conditions mba608 sda scl p stop condition s start condition fig 14. data transfer on the i 2 c-bus s p sda scl msb 0 1 6 7 8 0 1 2 to 7 8 ack ack 002aab0 12 start condition stop condition acknowledgement signal from receiver byte complete, interrupt within receiver clock line held low while interrupt is serviced fig 15. acknowledge on the i 2 c-bus s 01 678 002aab013 data output by transmitter data output by receiver scl from master start condition transmitter stays off of the bus during the acknowledge clock acknowledgement signal from receiver
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 33 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir there are two exceptions to the ?acknowledge after every byte? rule. the first occurs when a master is a receiver: it must signal an end of data to the transmitter by not signalling an acknowledge on the last byte that has been clocked out of the slave. the acknowledge related clock, generated by th e master should still take place, but the sda line will not be pulled down. in order to indicate that this is an active and intentional lack of acknowledgement, we shall term this special conditio n as a ?negative acknowledge?. the second exception is that a slave will send a negative acknowledge when it can no longer accept additional data bytes. this occu rs after an attempted tran sfer that cannot be accepted. 10.2 addressing and transfer formats each device on the bus has its own unique address. before any data is transmitted on the bus, the master transmits on the bus the ad dress of the slave to be accessed for this transaction. a well-behaved slave with a matc hing address, if it exists on the network, should of course acknowledge the master's addressing. the addressing is done by the first byte transmitted by the ma ster after the start condition. an address on the network is seven bits long, appearing as the most si gnificant bits of the address byte. the last bit is a direction (r/w ) bit. a ?0? indicates that the master is transmitting (write) and a ?1? indicates that the master requests data (read). a complete data transfer, comprised of an address byte indicating a ?write? and two data bytes is shown in figure 16 . when an address is sent, each device in th e system compares the first seven bits after the start with its own address. if there is a match, the device will consider itself addressed by the mast er, and will send an acknowledge. th e device could also determine if in this transaction it is assigned the role of a slave receiver or slave transmitter, depending on the r/w bit. each node of the i 2 c-bus network has a unique seven-bit address. the address of a microcontroller is of course fully programmabl e, while peripheral devices usually have fixed and programmable address portions. when the master is communicating with one device only, data transfers follow the format of figure 16 , where the r/w bit could indicate either direction. after completing the transfer and issuing a stop condition, if a master would like to address some other device on the network, it could start a nother transaction by issuing a new start. fig 16. a complete data transfer s p sda scl 0 to 6 78 ack 002aab0 46 start condition stop condition address r/w 0 to 6 78 data ack 0 to 6 78 data ack
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 34 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir another way for a master to communicate with several different devices would be by using a ?repeated start?. after the last byte of the transaction was transferred, including its acknowledge (or negative acknowledge), the ma ster issues another start, followed by address byte and data?without effecting a stop. the master may communicate with a number of different devices, combining ?reads? and ?writes?. after the last transfer takes place, the master issues a stop and rel eases the bus. possible data formats are demonstrated in figure 17 . note that the repeated start allows for both change of a slave and a change of direction, without rele asing the bus. we shall see later on that the change of direction feature can come in handy even when dealing with a single device. in a single master system, the repeated st art mechanism may be more efficient than terminating each transfer with a stop and starting again. in a multimaster environment, the determination of which format is more ef ficient could be more complicated, as when a master is using repeated starts it occupies the bus for a long time and thus preventing other devices from in itiating transfers. fig 17. i 2 c-bus data formats 002aab458 data slave address master write: s w a data a a p data transferred (n bytes + acknowledge) start condition stop condition acknowledge acknowledge acknowledge write data slave address master read: s r a data a na p data transferred (n bytes + acknowledge) start condition stop condition acknowledge acknowledge not acknowledge read data slave address combined formats: s r/w a data a a p data transferred (n bytes + acknowledge) start condition stop condition acknowledge acknowledge acknowledge read or write slave address sr r/w a repeated start condition acknowledge read or write direction of transfer may change at this point data transferred (n bytes + acknowledge)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 35 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 10.3 addressing before any data is transmitte d or received, the master mu st send the address of the receiver via the sda line. the first byte afte r the start condition carries the address of the slave device and the read/write bit. ta b l e 2 8 shows how the SC16IS741?s address can be selected by using a1 and a0 pins. for ex ample, if these 2 pins are connected to v dd , then the SC16IS741?s address is set to 0x90, and the master communicates with it through this address. [1] x = logic 0 for write cycl e; x = logic 1 for read cycle. [2] consult figure 23 and figure 24 if a1 or a0 is connected to scl or sda. 10.4 use of subaddresses when a master communicates with the SC16IS741 it must send a subaddress in the byte following the slave address byte. this subaddre ss is the internal address of the word the master wants to access for a single byte tr ansfer, or the beginning of a sequence of locations for a multi-byte transfer. a subadd ress is an 8-bit byte. unlike the device address, it does not contain a direction (r/w ) bit, and like any byte transferred on the bus it must be followed by an acknowledge. ta b l e 2 9 shows the breakdown of the subaddress (register address) byte. bit 0 is not used, bits [2:1] are both set to zeroes, bits [6:3] are used to select one of the device?s internal registers, and bit 7 is not used. a register write cycle is shown in figure 18 . the start is followed by a slave address byte with the direction bit set to ?write?, a subaddress byte, a number of data bytes, and a stop signal. the subaddress indicates which register the master wants to access, and the data bytes which follow will be written one after the other to the subaddress location. table 28. SC16IS741 address map a1 a0 SC16IS741 i 2 c addresses (hex) [1] [2] v dd v dd 0x90 (1001 000x) v dd v ss 0x92 (1001 001x) v dd scl 0x94 (1001 010x) v dd sda 0x96 (1001 011x) v ss v dd 0x98 (1001 100x) v ss v ss 0x9a (1001 101x) v ss scl 0x9c (1001 110x) v ss sda 0x9e (1001 111x) scl v dd 0xa0 (1010 000x) scl v ss 0xa2 (1010 001x) scl scl 0xa4 (1010 010x) scl sda 0xa6 (1010 011x) sda v dd 0xa8 (1010 100x) sda v ss 0xaa (1010 101x) sda scl 0xac (1010 110x) sda sda 0xae (1010 111x)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 36 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir ta b l e 2 9 and ta b l e 3 0 show the bits? presentation at the subaddress byte for i 2 c-bus and spi interfaces. bit 0 is not used, bits 2:1 sele ct the channel, bits 6:3 select one of the uart internal registers. bit 7 is not used with the i 2 c-bus interface, but it is used by the spi interface to indicate a read or a write operation. the register r ead cycle (see figure 19 ) commences in a similar manner, with the master sending a slave address with the direction bit set to ?write? with a following subaddress. then, in order to reverse the direction of the transfer, the master issues a repeated start followed again by the device address, but this time with the direction bit set to ?read?. the data bytes starting at the internal suba ddress will be clocked out of the device, each followed by a mast er-generated acknowledge. the last byte of the read cycle will be followed by a negative acknowledge, signa lling the end of transfer. the cycle is terminated by a stop signal. white block: host to SC16IS741 grey block: SC16IS741 to host (1) see table 29 for additional information. fig 18. master writes to slave s slave address 002aab047 w a register address (1) a n data a p white block: host to SC16IS741 grey block: SC16IS741 to host (1) see table 29 for additional information. fig 19. master read from slave s slave address 002aab048 w a register address (1) a na p s slave address r a n data a last data table 29. register address byte (i 2 c) bit name function 7 - not used 6:3 a[3:0] uart?s internal register select 2:1 ch1, ch0 channel select: ch1 = 0, ch0 = 0 other values are reserved and should not be used. 0 - not used
xxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x xxxxxxxxxxxxxx xxxxxxxxxx xxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxx x x SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 37 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64- byte fifos, irda sir 11. spi operation r/w = 0; a[3:0] = register address; ch1 = 0, ch0 = 0 a. register write r/w = 1; a[3:0] = register address; ch1 = 0, ch0 = 0 b. register read r/w = 0; a[3:0] = 0000; ch1 = 0, ch0 = 0 c. fifo write cycle r/w = 1; a[3:0] = 0000; ch1 = 0, ch0 = 0 d. fifo read cycle (1) last bit (d0) of the last byte to be written to the transmit fifo. (2) last bit (d0) of the last byte to be read from the receive fifo. fig 20. spi operation si a1 a2 a3 r/w sclk ch1 a0 x ch0 d6 d7 d4 d5 d2 d3 d0 d1 002aab433 si a1 a2 a3 r/w sclk ch1 a0 x ch0 002aab434 so d6 d7 d4 d5 d2 d3 d0 d1 si a1 a2 a3 r/w sclk ch1 a0 x ch0 d6 d7 d4 d5 d2 d3 d0 d1 002aab435 d6 d7 d4 d5 d2 d3 d0 d1 last bit (1) si a1 a2 a3 r/w sclk ch1 a0 x ch0 002aab436 so d6 d7 d4 d5 d2 d3 d0 d1 d0 d1 last bit (2) d6 d7 d4 d5 d2 d3
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 38 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 12. limiting values [1] 5.5 v steady state voltage tolerance on inputs and outputs is valid only when the supply voltage is present. 4.6 v steady state voltage tolerance on input s and outputs when no supply voltage is present. 13. static characteristics table 30. register address byte (spi) bit name function 7r/w 1: read from uart 0: write to uart 6:3 a[3:0] uart?s internal register select 2:1 ch1, ch0 channel select: ch1 = 0, ch0 = 0 other values are reserved and should not be used. 0 - not used table 31. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit v dd supply voltage ? 0.3 +4.6 v v i input voltage any input ? 0.3 +5.5 [1] v i i input current any input ? 10 +10 ma i o output current any output ? 10 +10 ma p tot total power dissipation - 300 mw p/out power dissipation per output -50mw t amb ambient temperature operating v dd =2.5v 0.2 v ? 40 +85 c v dd =3.3v 0.3 v ? 40 +95 c t j junction temperature - +125 c t stg storage temperature ? 65 +150 c table 32. static characteristics v dd =2.5v 0.2 v, t amb = ? 40 cto+85 c; or v dd =3.3v 0.3 v, t amb = ? 40 cto+95 c; unless otherwise specified. symbol parameter conditions v dd =2.5v v dd =3.3v unit min max min max supplies v dd supply voltage 2.3 2.7 3.0 3.6 v i dd supply current operating; no load - 6.0 - 6.0 ma inputs i2c/spi , rx, cts v ih high-level input voltage 1.6 5.5 [1] 2.0 5.5 [1] v v il low-level input voltage - 0.6 - 0.8 v i l leakage current input; v i = 0 v or 5.5 v [1] -1-1 a c i input capacitance - 3 - 3 pf
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 39 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir [1] 5.5 v steady state voltage tolerance on inputs and outputs is valid only when the supply voltage is present. 3.8 v steady stat e voltage tolerance on inputs and outputs when no supply voltage is present. [2] xtal2 should be left open when xtal1 is driven by an external clock. outputs tx, rts , so v oh high-level output voltage i oh = ? 400 a 1.85---v i oh = ? 4ma - - 2.4 - v v ol low-level output voltage i ol =1.6ma - 0.4 - - v i ol =4ma - - - 0.4 v c o output capacitance - 4 - 4 pf output irq v ol low-level output voltage i ol =1.6ma - 0.4 - - v i ol =4ma - - - 0.4 v c o output capacitance - 4 - 4 pf i 2 c-bus input/output sda v ih high-level input voltage 1.6 5.5 [1] 2.0 5.5 [1] v v il low-level input voltage - 0.6 - 0.8 v v ol low-level output voltage i ol =1.6ma - 0.4 - - v i ol =4ma - - - 0.4 v i l leakage current input; v i = 0 v or 5.5 v [1] -10-10 a c o output capacitance - 7 - 7 pf i 2 c-bus inputs scl, cs /a0, si/a1 v ih high-level input voltage 1.6 5.5 [1] 2.0 5.5 [1] v v il low-level input voltage - 0.6 - 0.8 v i l leakage current input; v i = 0 v or 5.5 v [1] -10-10 a c i input capacitance - 7 - 7 pf clock input xtal1 [2] v ih high-level input voltage 1.8 5.5 [1] 2.4 5.5 [1] v v il low-level input voltage - 0.45 - 0.6 v i l leakage current input; v i = 0 v or 5.5 v [1] ? 30 +30 ? 30 +30 a c i input capacitance - 3 - 3 pf sleep current i dd(sleep) sleep mode supply current inputs are at v dd or ground - 30 - 30 a table 32. static characteristics ?continued v dd =2.5v 0.2 v, t amb = ? 40 cto+85 c; or v dd =3.3v 0.3 v, t amb = ? 40 cto+95 c; unless otherwise specified. symbol parameter conditions v dd =2.5v v dd =3.3v unit min max min max
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 40 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 14. dynamic characteristics [1] a detailed description of the i 2 c-bus specification, with applicati ons, is given in user manual um10204: ?i 2 c-bus specification and user manual? . this may be found at www.nxp.com/acrobat_download/usermanuals/um10204.pdf . [2] minimum scl clock frequency is limited by the bus time-out feature, which resets t he serial bus interface if sda is held low for a minimum of 25 ms. [3] 2 xtal1 clocks or 3 s, whichever is less. [4] the device will not acknowledge if an i 2 c-bus transaction occurs during the ?scl delay time after reset?. table 33. i 2 c-bus timing specifications [1] all the timing limits are valid withi n the operating supply voltage, ambi ent temperature range and output load; v dd =2.5v 0.2 v, t amb = ? 40 cto+85 c; or v dd =3.3v 0.3 v, t amb = ? 40 cto+95 c; and refer to v il and v ih with an input voltage of v ss to v dd . all output load = 25 pf, except sda output load = 400 pf. symbol parameter conditions standard mode i 2 c-bus fast mode i 2 c-bus unit min max min max f scl scl clock frequency [2] 0 100 0 400 khz t buf bus free time between a stop and start condition 4.7 - 1.3 - s t hd;sta hold time (repeated) start condition 4.0 - 0.6 - s t su;sta set-up time for a repeated start condition 4.7 - 0.6 - s t su;sto set-up time for stop condition 4.7 - 0.6 - s t hd;dat data hold time 0 - 0 - ns t vd;ack data valid acknowledge time - 0.6 - 0.6 s t vd;dat data valid time scl low to data out valid -0.6-0.6ns t su;dat data set-up time 250 - 150 - ns t low low period of the scl clock 4.7 - 1.3 - s t high high period of the scl clock 4.0 - 0.6 - s t f fall time of both sda and scl signals - 300 - 300 ns t r rise time of both sda and scl signals - 1000 - 300 ns t sp pulse width of spikes that must be suppressed by the input filter - 50 - 50 ns t d(int_v)modem modem interrupt valid delay time 0.2 - 0.2 - s t d(int_clr)modem modem interrupt clear delay time 0.2 - 0.2 - s t d(int_v)rx receive interrupt valid delay time 0.2 - 0.2 - s t d(int_clr)rx receive interrupt clea r delay time 0.2 - 0.2 - s t d(int_clr)tx transmit interrupt clear delay time 1.0 - 0.5 - s t d(rst-scl) scl delay time after reset [3] [4] 3-3- s t d(scl-a) delay time from scl to address - 30 - 30 ns t d(sda-a) delay time from sda to address - 30 - 30 ns t d(a-scl) delay time from address to scl - 30 - 30 ns t d(a-sda) delay time from address to sda - 30 - 30 ns t w(rst) reset pulse width 3 - 3 - s
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 41 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir fig 21. scl delay after reset rise and fall times refer to v il and v ih . fig 22. i 2 c-bus timing diagram fig 23. i 2 c-bus address selection a1/a0 delay fig 24. i 2 c-bus address selection scl/sda delay 002aaf47 2 reset scl t d(rst-scl) t w(rst) scl sda t hd;sta t su;dat t hd;dat t f t buf t su;sta t low t high t vd;ack 002aab489 t su;sto protocol start condition (s) bit 7 msb (a7) bit 6 (a6) bit 0 lsb (r/w) acknowledge (a) stop condition (p) 1 /f scl t r t vd;dat t sp 002aaf164 scl, sda a1, a0 t d(sda-a) t d(scl-a) 002aaf165 scl, sda a1, a0 t d(a-sda) t d(a-scl)
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 42 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir fig 25. modem input pin interrupt 002aaf468 a w sda a r irq t d(int_v)modem s a data a ack to master slave address msr register slave address a t d(int_clr)modem modem pin fig 26. receive interrupt d0 d1 d2 d3 d4 d5 d6 d7 002aaf470 next start bit stop bit start bit t d(int_v)rx rx irq fig 27. receive interrupt clear 002aaf46 9 a w sda a r irq s a data a slave address rhr slave address a t d(int_clr)rx p fig 28. transmit interrupt clear 002aaf471 a w sda irq a data a thr register slave address a t d(int_clr)tx
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 43 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir [1] applies to external clock, crystal oscillator max. 24 mhz. [2] table 34. f xtal dynamic characteristics v dd =2.5v 0.2 v, t amb = ? 40 cto+85 c; or v dd =3.3v 0.3 v, t amb = ? 40 cto+95 c symbol parameter conditions v dd =2.5v v dd =3.3v unit min max min max t wh pulse width high 10 - 6 - ns t wl pulse width low 10 - 6 - ns f xtal frequency on pin xtal [1] [2] -48-80mhz f xtal 1 t wclk () -------------- - = fig 29. external clock timing external clock 002aac35 7 t w(clk) t wl t wh
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 44 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir table 35. spi-bus timing specifications all the timing limits are valid withi n the operating supply voltage, ambi ent temperature range and output load; v dd =2.5v 0.2 v, t amb = ? 40 cto+85 c; or v dd =3.3v 0.3 v, t amb = ? 40 cto+95 c; and refer to v il and v ih with an input voltage of v ss to v dd . all output load = 25 pf, unless otherwise specified. symbol parameter conditions min typ max unit t tr cs high to so 3-state delay time c l = 100 pf - - 100 ns t css cs to sclk setup time 100 - - ns t csh cs to sclk hold time 20 - - ns t do sclk fall to so valid delay time c l = 100 pf - - 100 ns t ds si to sclk setup time 100 - - ns t dh si to sclk hold time 20 - - ns t cp sclk period t cl + t ch 250 - - ns t ch sclk high time 100 - - ns t cl sclk low time 100 - - ns t csw cs high pulse width 200 - - ns t d(int_clr)tx transmit interrupt clear delay time 200 - - ns t d(int_clr)rx receive interrupt clear delay time 200 - - ns t w(rst) reset pulse width 3 - - s fig 30. detailed spi-bus timing t csh t css t cl t ch t csh t do t tr t ds t dh so si sclk cs 002aab06 6 t csw
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 45 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir r/w = 0; a[3:0] = thr (0x00); ch1 = 0; ch0 = 0 fig 31. spi write thr to clear tx int si a1 a2 a3 r/w sclk ch1 a0 x ch0 002aaf473 so d6 d7 d4 d5 d2 d3 d0 d1 cs t d(int_clr)tx irq r/w = 1; a[3:0] = rhr (0x00); ch1 = 0; ch0 = 0 fig 32. read rhr to clear rx int si a1 a2 a3 r/w sclk ch1 a0 x ch0 002aaf474 so cs t d(int_clr)rx irq d6 d7 d4 d5 d2 d3 d0 d1
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 46 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 15. package outline fig 33. package outline sot403-1 (tssop16) unit a 1 a 2 a 3 b p cd (1) e (2) (1) eh e ll p qz y w v references outline version european projection issue date iec jedec jeita mm 0.15 0.05 0.95 0.80 0.30 0.19 0.2 0.1 5.1 4.9 4.5 4.3 0.65 6.6 6.2 0.4 0.3 0.40 0.06 8 0 o o 0.13 0.1 0.2 1 dimensions (mm are the original dimensions) notes 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. plastic interlead protrusions of 0.25 mm maximum per side are not included. 0.75 0.50 sot403-1 mo-153 99-12-27 03-02-18 w m b p d z e 0.25 18 16 9 a a 1 a 2 l p q detail x l (a ) 3 h e e c v m a x a y 0 2.5 5 mm scale tssop16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm sot403 -1 a max. 1.1 pin 1 index
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 47 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 16. handling information all input and output pins are protected ag ainst electrostatic discharge (esd) under normal handling. when handling ensure that the appropriate precautions are taken as described in jesd625-a or equivalent standards. 17. soldering of smd packages this text provides a very brief insight into a complex technology. a more in-depth account of soldering ics can be found in application note an10365 ?surface mount reflow soldering description? . 17.1 introduction to soldering soldering is one of the most common methods through which packages are attached to printed circuit boards (pcbs), to form electr ical circuits. the soldered joint provides both the mechanical and the electrical connection. th ere is no single sold ering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mount devices (smds) are mixed on one printed wiring board; however, it is not suitable for fine pitch smds. reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 17.2 wave and reflow soldering wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. the wave soldering process is suitable for the following: ? through-hole components ? leaded or leadless smds, which are glued to the surface of the printed circuit board not all smds can be wave soldered. packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. also, leaded smds with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased pr obability of bridging. the reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. leaded packages, packages with solder balls, and leadless packages are all reflow solderable. key characteristics in both wave and reflow soldering are: ? board specifications, in cluding the board finish , solder masks and vias ? package footprints, including solder thieves and orientation ? the moisture sensitivit y level of the packages ? package placement ? inspection and repair ? lead-free soldering versus snpb soldering 17.3 wave soldering key characteristics in wave soldering are:
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 48 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir ? process issues, such as application of adhe sive and flux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave ? solder bath specifications, including temperature and impurities 17.4 reflow soldering key characteristics in reflow soldering are: ? lead-free versus snpb solderi ng; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see figure 34 ) than a snpb process, thus reducing the process window ? solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board ? reflow temperature profile; this profile includ es preheat, reflow (in which the board is heated to the peak temperature) and coolin g down. it is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). in addition, the peak temperature must be low enough that the packages and/or boards are not damaged. the peak temperature of the package depends on package thickness and volume and is classified in accordance with ta b l e 3 6 and 37 moisture sensitivity precautions, as indicat ed on the packing, must be respected at all times. studies have shown that small packages reach higher temperatures during reflow soldering, see figure 34 . table 36. snpb eutectic process (from j-std-020c) package thickness (mm) package reflow temperature ( c) volume (mm 3 ) < 350 350 < 2.5 235 220 2.5 220 220 table 37. lead-free process (from j-std-020c) package thickness (mm) package reflow temperature ( c) volume (mm 3 ) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 2.5 260 250 245 > 2.5 250 245 245
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 49 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir for further information on temperature profiles, refer to application note an10365 ?surface mount reflow soldering description? . 18. abbreviations 19. revision history msl: moisture sensitivity level fig 34. temperature profiles for large and small components 001aac844 temperature time minimum peak temperature = minimum soldering temperature maximum peak temperature = msl limit, damage level peak temperature table 38. abbreviations acronym description cpu central processing unit fifo first in, first out i 2 c-bus inter ic bus irda infrared data association lcd liquid crystal display mir medium infrared por power-on reset sir serial infrared spi serial peripheral interface uart universal asynchronous receiver/transmitter table 39. revision history document id release date data sheet status change notice supersedes SC16IS741_1 20100429 product data sheet - -
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 50 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir 20. legal information 20.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 20.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 20.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interrupt ion, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on a weakness or default in the customer application/use or the application/use of customer?s third party customer(s) (hereinafter both referred to as ?application?). it is customer?s sole responsibility to check whether the nxp semiconductors product is suitable and fit for the application planned. customer has to do all necessary testing for the application in order to avoid a default of the application and the product. nxp semiconducto rs does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. export control ? this document as well as the item(s) described herein may be subject to export control regulations. export might require a prior authorization from national authorities. non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicond uctors product is au tomotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive sp ecifications and standards, customer (a) shall use the product without nx p semiconductors? warranty of the document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this docu ment contains the product specification.
SC16IS741_1 ? nxp b.v. 2010. all rights reserved. product data sheet rev. 01 ? 29 april 2010 51 of 52 nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully in demnifies nxp semi conductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive appl ications beyond nxp semiconductors? standard warranty and nxp semicond uctors? product specifications. 20.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. i 2 c-bus ? logo is a trademark of nxp b.v. 21. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors SC16IS741 single uart with i 2 c-bus/spi interface, 64-byte fifos, irda sir ? nxp b.v. 2010. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 29 april 2010 document identifier: SC16IS741_1 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 22. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.1 general features . . . . . . . . . . . . . . . . . . . . . . . . 1 2.2 i 2 c-bus features . . . . . . . . . . . . . . . . . . . . . . . . 2 2.3 spi features . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 ordering information . . . . . . . . . . . . . . . . . . . . . 2 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 7 functional description . . . . . . . . . . . . . . . . . . . 5 7.1 trigger levels . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.2 hardware flow control . . . . . . . . . . . . . . . . . . . . 6 7.2.1 auto rts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.2.2 auto cts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.3 software flow control . . . . . . . . . . . . . . . . . . . . 8 7.3.1 rx. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.3.2 tx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.4 hardware reset, power-on reset (por) and software reset . . . . . . . . . . . . . . . . . . . . . 10 7.5 interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.5.1 interrupt mode operation . . . . . . . . . . . . . . . . 12 7.5.2 polled mode operation . . . . . . . . . . . . . . . . . . 12 7.6 sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.7 break and time-out conditions . . . . . . . . . . . . 13 7.8 programmable baud rate generator . . . . . . . . 13 8 register descriptions . . . . . . . . . . . . . . . . . . . 16 8.1 receive holding register (rhr) . . . . . . . . . . 19 8.2 transmit holding register (thr) . . . . . . . . . . 19 8.3 fifo control register (fcr) . . . . . . . . . . . . . 19 8.4 line control register (lcr) . . . . . . . . . . . . . . 20 8.5 line status register (lsr) . . . . . . . . . . . . . . . 22 8.6 modem control register (mcr) . . . . . . . . . . . 23 8.7 modem status register (msr) . . . . . . . . . . . . 24 8.8 interrupt enable register (ier) . . . . . . . . . . . 25 8.9 interrupt identific ation register (iir). . . . . . . . 26 8.10 enhanced features register (efr) . . . . . . . . 27 8.11 division registers (dll, dlh) . . . . . . . . . . . . . 27 8.12 transmission control register (tcr). . . . . . . 28 8.13 trigger level register (tlr) . . . . . . . . . . . . . 28 8.14 transmitter fifo level re gister (txlvl) . . . . 28 8.15 receiver fifo level register (rxlvl) . . . . . . 29 8.16 extra features control register (efcr) . . . . 29 9 rs-485 features . . . . . . . . . . . . . . . . . . . . . . . . 30 9.1 auto rs-485 rts control . . . . . . . . . . . . . . . . 30 9.2 rs-485 rts output inversion . . . . . . . . . . . . 30 9.3 auto rs-485 . . . . . . . . . . . . . . . . . . . . . . . . . 30 9.3.1 normal multidrop mode . . . . . . . . . . . . . . . . . 30 9.3.2 auto address detection . . . . . . . . . . . . . . . . . 31 10 i 2 c-bus operation . . . . . . . . . . . . . . . . . . . . . . 31 10.1 data transfers . . . . . . . . . . . . . . . . . . . . . . . . 31 10.2 addressing and transfer fo rmats . . . . . . . . . . 33 10.3 addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 10.4 use of subaddresses . . . . . . . . . . . . . . . . . . . 35 11 spi operation . . . . . . . . . . . . . . . . . . . . . . . . . . 37 12 limiting values . . . . . . . . . . . . . . . . . . . . . . . . 38 13 static characteristics . . . . . . . . . . . . . . . . . . . 38 14 dynamic characteristics. . . . . . . . . . . . . . . . . 40 15 package outline. . . . . . . . . . . . . . . . . . . . . . . . 46 16 handling information . . . . . . . . . . . . . . . . . . . 47 17 soldering of smd packages . . . . . . . . . . . . . . 47 17.1 introduction to soldering. . . . . . . . . . . . . . . . . 47 17.2 wave and reflow soldering. . . . . . . . . . . . . . . 47 17.3 wave soldering . . . . . . . . . . . . . . . . . . . . . . . 47 17.4 reflow soldering . . . . . . . . . . . . . . . . . . . . . . 48 18 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 49 19 revision history . . . . . . . . . . . . . . . . . . . . . . . 49 20 legal information . . . . . . . . . . . . . . . . . . . . . . 50 20.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 50 20.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 20.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 50 20.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 51 21 contact information . . . . . . . . . . . . . . . . . . . . 51 22 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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