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| Features * High Performance, Low Power AVR(R) 8-Bit Microcontroller * Advanced RISC Architecture - 125 Powerful Instructions - Most Single Clock Cycle Execution - 32 x 8 General Purpose Working Registers - Fully Static Operation - Up to 16 MIPS Throughput at 16 MHz * Non-volatile Program and Data Memories - 8K/16K/32K Bytes of In-System Self-Programmable Flash - 512/512/1024 EEPROM - 512/512/1024 Internal SRAM - Write/Erase Cycles: 10,000 Flash/ 100,000 EEPROM - Data retention: 20 years at 85C/ 100 years at 25C(1) - Optional Boot Code Section with Independent Lock Bits In-System Programming by on-chip Boot Program hardware-activated after reset True Read-While-Write Operation - Programming Lock for Software Security * USB 2.0 Full-speed Device Module with Interrupt on Transfer Completion - Complies fully with Universal Serial Bus Specification REV 2.0 - 48 MHz PLL for Full-speed Bus Operation : data transfer rates at 12 Mbit/s - Fully independant 176 bytes USB DPRAM for endpoint memory allocation - Endpoint 0 for Control Transfers: from 8 up to 64-bytes - 4 Programmable Endpoints: IN or Out Directions Bulk, Interrupt and IsochronousTransfers Programmable maximum packet size from 8 to 64 bytes Programmable single or double buffer - Suspend/Resume Interrupts - Microcontroller reset on USB Bus Reset without detach - USB Bus Disconnection on Microcontroller Request * Peripheral Features - One 8-bit Timer/Counters with Separate Prescaler and Compare Mode (two 8-bit PWM channels) - One 16-bit Timer/Counter with Separate Prescaler, Compare and Capture Mode (three 8-bit PWM channels) - USART with SPI master only mode and hardware flow control (RTS/CTS) - Master/Slave SPI Serial Interface - Programmable Watchdog Timer with Separate On-chip Oscillator - On-chip Analog Comparator - Interrupt and Wake-up on Pin Change * On Chip Debug Interface (debugWIRE) * Special Microcontroller Features - Power-On Reset and Programmable Brown-out Detection - Internal Calibrated Oscillator - External and Internal Interrupt Sources - Five Sleep Modes: Idle, Power-save, Power-down, Standby, and Extended Standby * I/O and Packages - 22 Programmable I/O Lines - QFN32 (5x5mm) / TQFP32 packages * Operating Voltages - 2.7 - 5.5V * Operating temperature - Industrial (-40C to +85C) * Maximum Frequency - 8 MHz at 2.7V - Industrial range - 16 MHz at 4.5V - Industrial range Note: 1. See "Data Retention" on page 6 for details. 8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller ATmega8U2 ATmega16U2 ATmega32U2 Summary 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 1. Pin Configurations Figure 1-1. Pinout 32 31 30 29 28 27 26 25 XTAL1 (PC0) XTAL2 GND VCC (PCINT11 / AIN2 ) PC2 (OC.0B / INT0) PD0 (AIN0 / INT1) PD1 (RXD1 / AIN1 / INT2) PD2 PC5 ( PCINT9/ OC.1B) UCAP PC4 (PCINT10) UGND AVCC UVCC D- D+ PB5 (PCINT5) PB4 (T1 / PCINT4) PB3 (PDO / MISO / PCINT3) UCAP PC4 (PCINT10) 9 10 11 12 13 14 15 16 (INT5/ AIN3) PD4 (XCK / AIN4 / PCINT12) PD5 (TXD1 / INT3) PD3 (CTS / HWB / AIN6 / T0 / INT7) PD7 (SCLK / PCINT1) PB1 (PDI / MOSI / PCINT2) PB2 (RTS / AIN5 / INT6) PD6 (SS / PCINT0) PB0 UGND AVCC UVCC DD+ 32 31 30 29 28 27 26 25 XTAL1 (PC0) XTAL2 GND VCC (PCINT11 /AIN2 ) PC2 (OC.0B / INT0) PD0 (AIN0 / INT1) PD1 (RXD1 / AIN1 / INT2) PD2 PC5 ( PCINT9/ OC.1B) 1 2 3 4 5 6 7 8 QFN32 24 23 22 21 20 19 18 17 Reset (PC1 / dW) PC6 (OC.1A / PCINT8) PC7 (INT4 / ICP1 / CLKO) PB7 (PCINT7 / OC.0A / OC.1C) PB6 (PCINT6) 1 2 3 4 5 6 7 8 (TXD1 / INT3) PD3 VQFP32 24 23 22 21 20 19 18 17 (SCLK / PCINT1) PB1 (PDI / MOSI / PCINT2) PB2 Reset (PC1 / dW) PC6 (OC.1A / PCINT8) PC7 (INT4 / ICP1 / CLKO) PB7 (PCINT7 / OC.0A / OC.1C) PB6 (PCINT6) PB5 (PCINT5) PB4 (T1 / PCINT4) PB3 (PDO / MISO / PCINT3) 9 10 11 12 13 14 15 16 (INT5/ AIN3) PD4 (XCK AIN4 / PCINT12) PD5 / HWB / AIN6 / T0 / INT7) PD7 (RTS / AIN5 / INT6) PD6 (SS / PCINT0) PB0 Note: The large center pad underneath the VQFP and QFN package should be soldered to ground on the board to ensure good mechanical stability. 1.1 Disclaimer Typical values contained in this datasheet are based on simulations and characterization of other AVR microcontrollers manufactured on the same process technology. Min and Max values will be available after the device is characterized. 2 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 2. Overview The ATmega8U2/16U2/32U2 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8U2/16U2/32U2 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. 2.1 Block Diagram Block Diagram Figure 2-1. PD7 - PD0 PC7 - PC0 PB7 - PB0 PORTD DRIVERS PORTC DRIVERS PORTB DRIVERS ANALOG COMPARATOR DATA REGISTER PORTD DATA DIR. REG. PORTD DATA REGISTER PORTC DATA DIR. REG. PORTC DATA REGISTER PORTB DATA DIR. REG. PORTB 8-BIT DA TA BUS VCC POR - BOD RESET GND INTERNAL OSCILLATOR CALIB. OSC Debug-Wire PROGRAM COUNTER STACK POINTER WATCHDOG TIMER OSCILLATOR ON-CHIP DEBUG PROGRAM FLASH SRAM MCU CONTROL REGISTER TIMING AND CONTROL PROGRAMMING LOGIC INSTRUCTION REGISTER GENERAL PURPOSE REGISTERS X Y Z TIMER/ COUNTERS UVcc INTERRUPT UNIT ON-CHIP 3.3V REGULATOR 1uF INSTRUCTION DECODER RESET XTAL1 XTAL2 7799CS-AVR-12/09 + - UCap CONTROL LINES ALU EEPROM PLL STATUS REGISTER USB D+/SCK D-/SDATA USART1 SPI PS/2 The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting 3 ATmega8U2/16U2/32U2 architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The ATmega8U2/16U2/32U2 provides the following features: 8K/16K/32K Bytes of In-System Programmable Flash with Read-While-Write capabilities, 512/512/1024 Bytes EEPROM, 512/512/1024 SRAM, 22 general purpose I/O lines, 32 general purpose working registers, two flexible Timer/Counters with compare modes and PWM, one USART, a programmable Watchdog Timer with Internal Oscillator, an SPI serial port, debugWIRE interface, also used for accessing the On-chip Debug system and programming and five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next interrupt or Hardware Reset. In Standby mode, the Crystal/Resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low power consumption. In Extended Standby mode, the main Oscillator continues to run. The device is manufactured using Atmel's high-density nonvolatile memory technology. The onchip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serial interface, by a conventional nonvolatile memory programmer, or by an on-chip Boot program running on the AVR core. The boot program can use any interface to download the application program in the application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the Atmel ATmega8U2/16U2/32U2 is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control applications. The ATmega8U2/16U2/32U2 are supported with a full suite of program and system development tools including: C compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation kits. 2.2 2.2.1 Pin Descriptions VCC Digital supply voltage. 2.2.2 GND Ground. 2.2.3 AVCC AVCC is the supply voltage pin (input) for all analog features (Analog Comparator, PLL). It should be externally connected to VCC through a low-pass filter. 2.2.4 Port B (PB7..PB0) Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port B also serves the functions of various special features of the ATmega8U2/16U2/32U2 as listed on page 74. 4 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 2.2.5 Port C (PC7..PC0) Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port C also serves the functions of various special features of the ATmega8U2/16U2/32U2 as listed on page 77. 2.2.6 Port D (PD7..PD0) Port D serves as analog inputs to the analog comparator. Port D also serves as an 8-bit bi-directional I/O port, if the analog comparator is not used (concerns PD2/PD1 pins). Port pins can provide internal pull-up resistors (selected for each bit). The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. 2.2.7 DUSB Full Speed Negative Data Upstream Port 2.2.8 D+ USB Full Speed Positive Data Upstream Port 2.2.9 UGND USB Ground. 2.2.10 UVCC USB Pads Internal Regulator Input supply voltage. 2.2.11 UCAP USB Pads Internal Regulator Output supply voltage. Should be connected to an external capacitor (1F). 2.2.12 RESET/PC1/dW Reset input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running. The minimum pulse length is given in "System Control and Reset" on page 47. Shorter pulses are not guaranteed to generate a reset. This pin alternatively serves as debugWire channel or as generic I/O. The configuration depends on the fuses RSTDISBL and DWEN. XTAL1 Input to the inverting Oscillator amplifier and input to the internal clock operating circuit. 2.2.14 XTAL2/PC0 Output from the inverting Oscillator amplifier if enabled by Fuse. Also serves as a generic I/O. 2.2.13 5 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 3. Resources A comprehensive set of development tools, application notes and datasheets are available for download on http://www.atmel.com/avr. 4. Code Examples This documentation contains simple code examples that briefly show how to use various parts of the device. Be aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is compiler dependent. Please confirm with the C compiler documentation for more details. These code examples assume that the part specific header file is included before compilation. For I/O registers located in extended I/O map, "IN", "OUT", "SBIS", "SBIC", "CBI", and "SBI" instructions must be replaced with instructions that allow access to extended I/O. Typically "LDS" and "STS" combined with "SBRS", "SBRC", "SBR", and "CBR". 5. Data Retention Reliability Qualification results show that the projected data retention failure rate is much less than 1 PPM over 20 years at 85C or 100 years at 25C. 6 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 6. Register Summary Address (0xFF) (0xFE) (0xFD) (0xFC) (0xFB) (0xFA) (0xF9) (0xF8) (0xF7) (0xF6) (0xF5) (0xF4) (0xF3) (0xF2) (0xF1) (0xF0) (0xEF) (0xEE) (0xED) (0xEC) (0xEB) (0xEA) (0xE9) (0xE8) (0xE7) (0xE6) (0xE5) (0xE4) (0xE3) (0xE2) (0xE1) (0xE0) (0xDF) (0xDE) (0xDD) (0xDC) (0xDB) (0xDA) (0xD9) (0xD8) (0xD7) (0xD6) (0xD5) (0xD4) (0xD3) (0xD2) (0xD1) (0xD0) (0xCF) (0xCE) (0xCD) (0xCC) (0xCB) (0xCA) (0xC9) (0xC8) (0xC7) (0xC6) (0xC5) (0xC4) (0xC3) (0xC2) (0xC1) (0xC0) (0xBF) Name Reserved Reserved Reserved Reserved UPOE Reserved Reserved Reserved Reserved Reserved Reserved UEINT Reserved UEBCLX UEDATX UEIENX UESTA1X UESTA0X UECFG1X UECFG0X UECONX UERST UENUM UEINTX Reserved UDMFN UDFNUMH UDFNUML UDADDR UDIEN UDINT UDCON Reserved Reserved Reserved Reserved Reserved Reserved Reserved USBCON Reserved Reserved Reserved Reserved Reserved CLKSTA CLKSEL1 CLKSEL0 Reserved UDR1 UBRR1H UBRR1L UCSR1D UCSR1C UCSR1B UCSR1A Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Bit 7 UPWE1 - Bit 6 UPWE0 - Bit 5 UPDRV1 - Bit 4 UPDRV0 - Bit 3 SCKI BYCT7:0 DAT7:0 Bit 2 DATAI EPINT4:0 - Bit 1 DPI - Bit 0 DMI - Page page 195 page 222 page 221 page 221 FLERRE CFGOK - NAKINE OVERFI UNDERFI EPSIZE2:0 - NAKOUTE STALLRQC NAKOUTI FNCERR - RXSTPE - RXOUTE CTRLDIR STALLEDE TXINE page 220 page 218 page 217 CURRBK1:0 NBUSYBK1:0 ALLOC EPDIR EPEN DTSEQ1:0 EPBK1:0 RSTDT RXSTPI FNUM7:0 UADD6:0 RXOUTI EPRST4:0 - page 216 page 215 page 214 page 214 page 214 EPTYPE1:0 FIFOCON ADDEN USBE RCCKSEL3 RCSUT1 UMSEL11 RXCIE1 RXC1 UPRSME UPRSMI RCCKSEL2 RCSUT0 UMSEL10 TXCIE1 TXC1 NAKINI - STALLRQ RWAL - EPNUM2:0 STALLEDI FNUM10:8 TXINI - page 219 page 213 page 213 page 213 page 212 EORSME EORSMI FRZCLK RCCKSEL1 EXSUT1 UPM11 UDRIE1 UDRE1 - WAKEUPE WAKEUPI RPUTX RCCKSEL0 EXSUT0 UPM10 RXEN1 FE1 - EORSTE EORSTI EXCKSEL3 RCE - SOFE SOFI RSTCPU EXCKSEL2 EXTE - RMWKUP RCON EXCKSEL1 - SUSPE SUSPI DETACH EXTON EXCKSEL0 CLKS - page 211 page 210 page 209 page 195 page 38 page 38 page 37 page 167 USART1 I/O Data Register USART1 Baud Rate Register High Byte USBS1 TXEN1 DOR1 UCSZ11 UCSZ12 PE1 CTSEN UCSZ10 RXB81 U2X1 RTSEN UCPOL1 TXB81 MPCM1 USART1 Baud Rate Register Low Byte page 171 page 171 page 171 page 169 page 168 page 167 7 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 Address (0xBE) (0xBD) (0xBC) (0xBB) (0xBA) (0xB9) (0xB8) (0xB7) (0xB6) (0xB5) (0xB4) (0xB3) (0xB2) (0xB1) (0xB0) (0xAF) (0xAE) (0xAD) (0xAC) (0xAB) (0xAA) (0xA9) (0xA8) (0xA7) (0xA6) (0xA5) (0xA4) (0xA3) (0xA2) (0xA1) (0xA0) (0x9F) (0x9E) (0x9D) (0x9C) (0x9B) (0x9A) (0x99) (0x98) (0x97) (0x96) (0x95) (0x94) (0x93) (0x92) (0x91) (0x90) (0x8F) (0x8E) (0x8D) (0x8C) (0x8B) (0x8A) (0x89) (0x88) (0x87) (0x86) (0x85) (0x84) (0x83) (0x82) (0x81) (0x80) (0x7F) (0x7E) (0x7D) Name Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved OCR1CH OCR1CL OCR1BH OCR1BL OCR1AH OCR1AL ICR1H ICR1L TCNT1H TCNT1L Reserved TCCR1C TCCR1B TCCR1A Reserved Reserved ACMUX Bit 7 - Bit 6 - Bit 5 - Bit 4 - Bit 3 - Bit 2 - Bit 1 - Bit 0 - Page Timer/Counter1 - Output Compare Register C High Byte Timer/Counter1 - Output Compare Register C Low Byte Timer/Counter1 - Output Compare Register B High Byte Timer/Counter1 - Output Compare Register B Low Byte Timer/Counter1 - Output Compare Register A High Byte Timer/Counter1 - Output Compare Register A Low Byte Timer/Counter1 - Input Capture Register High Byte Timer/Counter1 - Input Capture Register Low Byte Timer/Counter1 - Counter Register High Byte Timer/Counter1 - Counter Register Low Byte FOC1A ICNC1 COM1A1 FOC1B ICES1 COM1A0 FOC1C COM1B1 WGM13 COM1B0 WGM12 COM1C1 CS12 COM1C0 CMUX2 CS11 WGM11 CMUX1 CS10 WGM10 CMUX0 page 135 page 135 page 135 page 135 page 135 page 135 page 135 page 135 page 134 page 134 page 134 page 133 page 129 page 225 8 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 Address (0x7C) (0x7B) (0x7A) (0x79) (0x78) (0x77) (0x76) (0x75) (0x74) (0x73) (0x72) (0x71) (0x70) (0x6F) (0x6E) (0x6D) (0x6C) (0x6B) (0x6A) (0x69) (0x68) (0x67) (0x66) (0x65) (0x64) (0x63) (0x62) (0x61) (0x60) 0x3F (0x5F) 0x3E (0x5E) 0x3D (0x5D) 0x3C (0x5C) 0x3B (0x5B) 0x3A (0x5A) 0x39 (0x59) 0x38 (0x58) 0x37 (0x57) 0x36 (0x56) 0x35 (0x55) 0x34 (0x54) 0x33 (0x53) 0x32 (0x52) 0x31 (0x51) 0x30 (0x50) 0x2F (0x4F) 0x2E (0x4E) 0x2D (0x4D) 0x2C (0x4C) 0x2B (0x4B) 0x2A (0x4A) 0x29 (0x49) 0x28 (0x48) 0x27 (0x47) 0x26 (0x46) 0x25 (0x45) 0x24 (0x44) 0x23 (0x43) 0x22 (0x42) 0x21 (0x41) 0x20 (0x40) 0x1F (0x3F) 0x1E (0x3E) 0x1D (0x3D) 0x1C (0x3C) 0x1B (0x3B) Name Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved TIMSK1 TIMSK0 Reserved PCMSK1 PCMSK0 EICRB EICRA PCICR Reserved OSCCAL PRR1 PRR0 REGCR WDTCKD CLKPR WDTCSR SREG SPH SPL Reserved Reserved Reserved Reserved Reserved SPMCSR Reserved MCUCR MCUSR SMCR Reserved DWDR ACSR Reserved SPDR SPSR SPCR GPIOR2 GPIOR1 PLLCSR OCR0B OCR0A TCNT0 TCCR0B TCCR0A GTCCR EEARH EEARL EEDR EECR GPIOR0 EIMSK EIFR PCIFR Bit 7 PCINT7 ISC71 ISC31 PRUSB CLKPCE WDIF I SP15 SP7 SPMIE ACD SPIF SPIE Bit 6 PCINT6 ISC70 ISC30 WDIE T SP14 SP6 RWWSB ACBG WCOL SPE Bit 5 ICIE1 PCINT5 ISC61 ISC21 PRTIM0 WDEWIFCM WDP3 H SP13 SP5 SIGRD USBRF ACO DORD Bit 4 PCINT12 PCINT4 ISC60 ISC20 WCLKD2 WDCE S SP12 SP4 RWWSRE ACI MSTR Bit 3 OCIE1C PCINT11 PCINT3 ISC51 ISC11 PRTIM1 WDEWIF CLKPS3 WDE V SP11 SP3 BLBSET WDRF SM2 ACIE - Bit 2 OCIE1B OCIE0B PCINT10 PCINT2 ISC50 ISC10 PRSPI WDEWIE CLKPS2 WDP2 N SP10 SP2 PGWRT BORF SM1 ACIC CPHA Bit 1 OCIE1A OCIE0A PCINT9 PCINT1 ISC41 ISC01 PCIE1 WCLKD1 CLKPS1 WDP1 Z SP9 SP1 PGERS IVSEL EXTRF SM0 ACIS1 SPR1 Bit 0 TOIE1 TOIE0 PCINT8 PCINT0 ISC40 ISC00 PCIE0 - Page page 135 page 106 page 87 page 87 page 85 page 84 page 86 page 38 Oscillator Calibration Register PRUSART1 REGDIS WCLKD0 CLKPS0 WDP0 C SP8 SP0 SPMEN IVCE PORF SE - page 46 page 46 page 196 page 57 page 39 page 56 page 9 page 12 page 12 page 242 page 65, 82 page 55 page 45 page 245 debugWIRE Data Register ACIS0 - page 224 page 147 SPI Data Register CPOL SPI2X SPR0 page 146 page 145 page 24 page 24 General Purpose I/O Register 2 General Purpose I/O Register 1 PLLP2 PLLP1 PLLP0 PLLE PLOCK Timer/Counter0 Output Compare Register B Timer/Counter0 Output Compare Register A Timer/Counter0 (8 Bit) FOC0A COM0A1 TSM FOC0B COM0A0 COM0B1 COM0B0 EEPROM Data Register INT7 INTF7 INT6 INTF6 EEPM1 INT5 INTF5 EEPM0 INT4 INTF4 EERIE INT3 INTF3 EEMPE INT2 INTF2 EEPE INT1 INTF1 PCIF1 EERE INT0 INTF0 PCIF0 General Purpose I/O Register 0 WGM02 CS02 CS01 WGM01 PSRASY CS00 WGM00 PSRSYNC page 40 page 106 page 106 page 106 page 105 page 105 page 89 page 20 page 20 page 20 page 21 page 25 page 86 page 86 page 86 EEPROM Address Register High Byte EEPROM Address Register Low Byte 9 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 Address 0x1A (0x3A) 0x19 (0x39) 0x18 (0x38) 0x17 (0x37) 0x16 (0x36) 0x15 (0x35) 0x14 (0x34) 0x13 (0x33) 0x12 (0x32) 0x11 (0x31) 0x10 (0x30) 0x0F (0x2F) 0x0E (0x2E) 0x0D (0x2D) 0x0C (0x2C) 0x0B (0x2B) 0x0A (0x2A) 0x09 (0x29) 0x08 (0x28) 0x07 (0x27) 0x06 (0x26) 0x05 (0x25) 0x04 (0x24) 0x03 (0x23) 0x02 (0x22) 0x01 (0x21) 0x00 (0x20) Name Reserved Reserved Reserved Reserved TIFR1 TIFR0 Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved PORTD DDRD PIND PORTC DDRC PINC PORTB DDRB PINB Reserved Reserved Reserved Bit 7 PORTD7 DDD7 PIND7 PORTC7 DDC7 PINC7 PORTB7 DDB7 PINB7 - Bit 6 PORTD6 DDD6 PIND6 PORTC6 DDC6 PINC6 PORTB6 DDB6 PINB6 - Bit 5 ICF1 PORTD5 DDD5 PIND5 PORTC5 DDC5 PINC5 PORTB5 DDB5 PINB5 - Bit 4 PORTD4 DDD4 PIND4 PORTC4 DDC4 PINC4 PORTB4 DDB4 PINB4 - Bit 3 OCF1C PORTD3 DDD3 PIND3 PORTB3 DDB3 PINB3 - Bit 2 OCF1B OCF0B PORTD2 DDD2 PIND2 PORTC2 DDC2 PINC2 PORTB2 DDB2 PINB2 - Bit 1 OCF1A OCF0A PORTD1 DDD1 PIND1 PORTC1 DDC1 PINC1 PORTB1 DDB1 PINB1 - Bit 0 TOV1 TOV0 PORTD0 DDD0 PIND0 PORTC0 DDC0 PINC0 PORTB0 DDB0 PINB0 - Page page 136 page 107 page 83 page 83 page 83 page 82 page 82 page 82 page 82 page 82 page 82 Note: 1. For compatibility with future devices, reserved bits should be written to zero if accessed. Moreover reserved bits are not guaranteed to be read as "0". Reserved I/O memory addresses should never be written. 2. I/O registers within the address range $00 - $1F are directly bit-accessible using the SBI and CBI instructions. In these registers, the value of single bits can be checked by using the SBIS and SBIC instructions. 3. Some of the status flags are cleared by writing a logical one to them. Note that the CBI and SBI instructions will operate on all bits in the I/O register, writing a one back into any flag read as set, thus clearing the flag. The CBI and SBI instructions work with registers 0x00 to 0x1F only. 4. When using the I/O specific commands IN and OUT, the I/O addresses $00 - $3F must be used. When addressing I/O registers as data space using LD and ST instructions, $20 must be added to these addresses. The ATmega8U2/16U2/32U2 is a complex microcontroller with more peripheral units than can be supported within the 64 location reserved in Opcode for the IN and OUT instructions. For the Extended I/O space from $60 - $1FF in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used. 10 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 7. Instruction Set Summary Mnemonics ADD ADC ADIW SUB SUBI SBC SBCI SBIW AND ANDI OR ORI EOR COM NEG SBR CBR INC DEC TST CLR SER RJMP IJMP JMP RCALL ICALL CALL RET RETI CPSE CP CPC CPI SBRC SBRS SBIC SBIS BRBS BRBC BREQ BRNE BRCS BRCC BRSH BRLO BRMI BRPL BRGE BRLT BRHS BRHC BRTS BRTC BRVS BRVC BRIE BRID SBI CBI LSL LSR Rd,Rr Rd,Rr Rd,Rr Rd,K Rr, b Rr, b P, b P, b s, k s, k k k k k k k k k k k k k k k k k k k P,b P,b Rd Rd k k k Operands Rd, Rr Rd, Rr Rdl,K Rd, Rr Rd, K Rd, Rr Rd, K Rdl,K Rd, Rr Rd, K Rd, Rr Rd, K Rd, Rr Rd Rd Rd,K Rd,K Rd Rd Rd Rd Rd BRANCH INSTRUCTIONS k Description Add two Registers Add with Carry two Registers Add Immediate to Word Subtract two Registers Subtract Constant from Register Subtract with Carry two Registers Subtract with Carry Constant from Reg. Subtract Immediate from Word Logical AND Registers Logical AND Register and Constant Logical OR Registers Logical OR Register and Constant Exclusive OR Registers One's Complement Two's Complement Set Bit(s) in Register Clear Bit(s) in Register Increment Decrement Test for Zero or Minus Clear Register Set Register Relative Jump Indirect Jump to (Z) Direct Jump Relative Subroutine Call Indirect Call to (Z) Direct Subroutine Call Subroutine Return Interrupt Return Compare, Skip if Equal Compare Compare with Carry Compare Register with Immediate Skip if Bit in Register Cleared Skip if Bit in Register is Set Skip if Bit in I/O Register Cleared Skip if Bit in I/O Register is Set Branch if Status Flag Set Branch if Status Flag Cleared Branch if Equal Branch if Not Equal Branch if Carry Set Branch if Carry Cleared Branch if Same or Higher Branch if Lower Branch if Minus Branch if Plus Branch if Greater or Equal, Signed Branch if Less Than Zero, Signed Branch if Half Carry Flag Set Branch if Half Carry Flag Cleared Branch if T Flag Set Branch if T Flag Cleared Branch if Overflow Flag is Set Branch if Overflow Flag is Cleared Branch if Interrupt Enabled Branch if Interrupt Disabled Operation Rd Rd + Rr Rd Rd + Rr + C Rdh:Rdl Rdh:Rdl + K Rd Rd - Rr Rd Rd - K Rd Rd - Rr - C Rd Rd - K - C Rdh:Rdl Rdh:Rdl - K Rd Rd * Rr Rd Rd * K Rd Rd v Rr Rd Rd v K Rd Rd Rr Rd 0xFF - Rd Rd 0x00 - Rd Rd Rd v K Rd Rd * (0xFF - K) Rd Rd + 1 Rd Rd - 1 Rd Rd * Rd Rd Rd Rd Rd 0xFF PC PC + k + 1 PC Z PC k PC PC + k + 1 PC Z PC k PC STACK PC STACK if (Rd = Rr) PC PC + 2 or 3 Rd - Rr Rd - Rr - C Rd - K if (Rr(b)=0) PC PC + 2 or 3 if (Rr(b)=1) PC PC + 2 or 3 if (P(b)=0) PC PC + 2 or 3 if (P(b)=1) PC PC + 2 or 3 if (SREG(s) = 1) then PCPC+k + 1 if (SREG(s) = 0) then PCPC+k + 1 if (Z = 1) then PC PC + k + 1 if (Z = 0) then PC PC + k + 1 if (C = 1) then PC PC + k + 1 if (C = 0) then PC PC + k + 1 if (C = 0) then PC PC + k + 1 if (C = 1) then PC PC + k + 1 if (N = 1) then PC PC + k + 1 if (N = 0) then PC PC + k + 1 if (N V= 0) then PC PC + k + 1 if (N V= 1) then PC PC + k + 1 if (H = 1) then PC PC + k + 1 if (H = 0) then PC PC + k + 1 if (T = 1) then PC PC + k + 1 if (T = 0) then PC PC + k + 1 if (V = 1) then PC PC + k + 1 if (V = 0) then PC PC + k + 1 if ( I = 1) then PC PC + k + 1 if ( I = 0) then PC PC + k + 1 I/O(P,b) 1 I/O(P,b) 0 Rd(n+1) Rd(n), Rd(0) 0 Rd(n) Rd(n+1), Rd(7) 0 Flags Z,C,N,V,H Z,C,N,V,H Z,C,N,V,S Z,C,N,V,H Z,C,N,V,H Z,C,N,V,H Z,C,N,V,H Z,C,N,V,S Z,N,V Z,N,V Z,N,V Z,N,V Z,N,V Z,C,N,V Z,C,N,V,H Z,N,V Z,N,V Z,N,V Z,N,V Z,N,V Z,N,V None None None None None None None None I None Z, N,V,C,H Z, N,V,C,H Z, N,V,C,H None None None None None None None None None None None None None None None None None None None None None None None None None None Z,C,N,V Z,C,N,V #Clocks 1 1 2 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 3 4 4 5 5 5 1/2/3 1 1 1 1/2/3 1/2/3 1/2/3 1/2/3 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 2 2 1 1 ARITHMETIC AND LOGIC INSTRUCTIONS BIT AND BIT-TEST INSTRUCTIONS Set Bit in I/O Register Clear Bit in I/O Register Logical Shift Left Logical Shift Right 11 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 Mnemonics ROL ROR ASR SWAP BSET BCLR BST BLD SEC CLC SEN CLN SEZ CLZ SEI CLI SES CLS SEV CLV SET CLT SEH CLH MOV MOVW LDI LD LD LD LD LD LD LDD LD LD LD LDD LDS ST ST ST ST ST ST STD ST ST ST STD STS LPM LPM LPM SPM IN OUT PUSH POP NOP SLEEP WDR BREAK Rd, P P, Rr Rr Rd Rd, Z Rd, Z+ Rd, Rr Rd, Rr Rd, K Rd, X Rd, X+ Rd, - X Rd, Y Rd, Y+ Rd, - Y Rd,Y+q Rd, Z Rd, Z+ Rd, -Z Rd, Z+q Rd, k X, Rr X+, Rr - X, Rr Y, Rr Y+, Rr - Y, Rr Y+q,Rr Z, Rr Z+, Rr -Z, Rr Z+q,Rr k, Rr Operands Rd Rd Rd Rd s s Rr, b Rd, b Description Rotate Left Through Carry Rotate Right Through Carry Arithmetic Shift Right Swap Nibbles Flag Set Flag Clear Bit Store from Register to T Bit load from T to Register Set Carry Clear Carry Set Negative Flag Clear Negative Flag Set Zero Flag Clear Zero Flag Global Interrupt Enable Global Interrupt Disable Set Signed Test Flag Clear Signed Test Flag Set Twos Complement Overflow. Clear Twos Complement Overflow Set T in SREG Clear T in SREG Set Half Carry Flag in SREG Clear Half Carry Flag in SREG Operation Rd(0)C,Rd(n+1) Rd(n),CRd(7) Rd(7)C,Rd(n) Rd(n+1),CRd(0) Rd(n) Rd(n+1), n=0..6 Rd(3..0)Rd(7..4),Rd(7..4)Rd(3..0) SREG(s) 1 SREG(s) 0 T Rr(b) Rd(b) T C1 C0 N1 N0 Z1 Z0 I1 I0 S1 S0 V1 V0 T1 T0 H1 H0 Rd Rr Rd+1:Rd Rr+1:Rr Rd K Rd (X) Rd (X), X X + 1 X X - 1, Rd (X) Rd (Y) Rd (Y), Y Y + 1 Y Y - 1, Rd (Y) Rd (Y + q) Rd (Z) Rd (Z), Z Z+1 Z Z - 1, Rd (Z) Rd (Z + q) Rd (k) (X) Rr (X) Rr, X X + 1 X X - 1, (X) Rr (Y) Rr (Y) Rr, Y Y + 1 Y Y - 1, (Y) Rr (Y + q) Rr (Z) Rr (Z) Rr, Z Z + 1 Z Z - 1, (Z) Rr (Z + q) Rr (k) Rr R0 (Z) Rd (Z) Rd (Z), Z Z+1 (Z) R1:R0 Rd P P Rr STACK Rr Rd STACK Flags Z,C,N,V Z,C,N,V Z,C,N,V None SREG(s) SREG(s) T None C C N N Z Z I I S S V V T T H H None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None None #Clocks 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 1 1 2 2 1 1 1 N/A DATA TRANSFER INSTRUCTIONS Move Between Registers Copy Register Word Load Immediate Load Indirect Load Indirect and Post-Inc. Load Indirect and Pre-Dec. Load Indirect Load Indirect and Post-Inc. Load Indirect and Pre-Dec. Load Indirect with Displacement Load Indirect Load Indirect and Post-Inc. Load Indirect and Pre-Dec. Load Indirect with Displacement Load Direct from SRAM Store Indirect Store Indirect and Post-Inc. Store Indirect and Pre-Dec. Store Indirect Store Indirect and Post-Inc. Store Indirect and Pre-Dec. Store Indirect with Displacement Store Indirect Store Indirect and Post-Inc. Store Indirect and Pre-Dec. Store Indirect with Displacement Store Direct to SRAM Load Program Memory Load Program Memory Load Program Memory and Post-Inc Store Program Memory In Port Out Port Push Register on Stack Pop Register from Stack MCU CONTROL INSTRUCTIONS No Operation Sleep Watchdog Reset Break (see specific descr. for Sleep function) (see specific descr. for WDR/timer) For On-chip Debug Only None None None 12 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 8. Ordering Information 8.1 ATmega8U2 Speed 16 MHz Power Supply 2.7 - 5.5V Ordering Code ATmega8U2-AU ATmega8U2-MU Package 32A 32M1-A Operational Range -40C to +85C Package Type 32A 32M1 32-lead, 7 x7 x 1.2 mm, lead pitch 0.8 mm Thin Quad Flat Package 32-pad, 5 x 5 x 1 mm body, pad pitch 0.50 mm Quad Flat No lead (QFN) 13 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 8.2 ATmega16U2 Speed 16 MHz Power Supply 2.7 - 5.5V Ordering Code ATmega16U2-AU ATmega16U2-MU Package 32A 32M1-A Operational Range -40C to +85C Package Type 32A 32M1 32-lead, 7 x7 x 1.2 mm, lead pitch 0.8 mm Thin Quad Flat Package 32-pad, 5 x 5 x 1 mm body, pad pitch 0.50 mm Quad Flat No lead (QFN) 14 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 8.3 ATmega32U2 Speed 16 MHz Power Supply 2.7 - 5.5V Ordering Code ATMEGA32U2-AU ATmega32U2-MU Package 32A 32M1-A Operational Range -40C to +85C Package Type 32A 32M1 32-lead, 7 x7 x 1.2 mm, lead pitch 0.8 mm Thin Quad Flat Package 32-pad, 5 x 5 x 1 mm body, pad pitch 0.50 mm Quad Flat No lead (QFN) 15 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 9. Packaging Information 9.1 QFN32 16 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 9.2 TQFP32 17 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 10. Errata 10.1 Errata ATmega8U2 The revision letter in this section refers to the revision of the ATmega8U2 device. 10.1.1 rev. A and rev B * Full Swing oscillator 1. Full Swing oscillator The maximum frequency for the Full Swing Crystal Oscillator is 8MHz. For Crystal frequencies > 8MHz the Full Swing Crystal Oscillator is not guaranteed to operate correctly. Problem fix/Workaround If a Crystal with frequency > 8MHz is used, the Low Power Crystal Oscillator option should be used instead. See table 8-1 for an overview of the Device Clocking Options. Note that the Low Power Crystal Oscillator will not provide full rail-to-rail swing on the XTAL2 pin. If system clock output is needed to drive other clock inputs while running from the Low Power Crystal Oscillator, the system clock can be output on PORTC7 by programming the CKOUT fuse. 10.2 Errata ATmega16U2 The revision letter in this section refers to the revision of the ATmega16U2 device. 10.2.1 rev. A and rev B * Full Swing oscillator 1. Full Swing oscillator The maximum frequency for the Full Swing Crystal Oscillator is 8MHz. For Crystal frequencies > 8MHz the Full Swing Crystal Oscillator is not guaranteed to operate correctly. Problem fix/Workaround If a Crystal with frequency > 8MHz is used, the Low Power Crystal Oscillator option should be used instead. See table 8-1 for an overview of the Device Clocking Options. Note that the Low Power Crystal Oscillator will not provide full rail-to-rail swing on the XTAL2 pin. If system clock output is needed to drive other clock inputs while running from the Low Power Crystal Oscillator, the system clock can be output on PORTC7 by programming the CKOUT fuse. 10.3 Errata ATmega32U2 The revision letter in this section refers to the revision of the ATmega32U2 device. 10.3.1 rev. C No Known Errata 18 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 10.3.2 rev. A and rev B * Full Swing oscillator 1. Full Swing oscillator The maximum frequency for the Full Swing Crystal Oscillator is 8MHz. For Crystal frequencies > 8MHz the Full Swing Crystal Oscillator is not guaranteed to operate correctly. Problem fix/Workaround If a Crystal with frequency > 8MHz is used, the Low Power Crystal Oscillator option should be used instead. See table 8-1 for an overview of the Device Clocking Options. Note that the Low Power Crystal Oscillator will not provide full rail-to-rail swing on the XTAL2 pin. If system clock output is needed to drive other clock inputs while running from the Low Power Crystal Oscillator, the system clock can be output on PORTC7 by programming the CKOUT fuse. 19 7799CS-AVR-12/09 ATmega8U2/16U2/32U2 11. Datasheet Revision History Please note that the referring page numbers in this section are referred to this document. The referring revision in this section are referring to the document revision. 11.1 Rev. 7799C - 12/09 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Updated "Features" on page 1. Added description of "AVCC" on page 4. Updated Figure 7-2 on page 18. Updated Figure 20-3 on page 186 and Figure 20-4 on page 187. Updated "Fuse Bits" on page 247. Updated "DC Characteristics" on page 264. Updated Table 26-3 on page 267, by removing Vrst. Updated Table 26-4 on page 268. Updated "Typical Characteristics" on page 273. Added new "Errata" on page 299. 11.2 Rev. 7799B - 06/09 1. Updated "Typical Characteristics" on page 273. 11.3 Rev. 7799A - 03/09 1. Initial revision. 20 7799CS-AVR-12/09 Headquarters Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 International Atmel Asia Unit 1-5 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-enYvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Product Contact Web Site www.atmel.com Technical Support avr@atmel.com Sales Contact www.atmel.com/contacts Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL'S TERMS AND CONDITIONS OF SALE LOCATED ON ATMEL'S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel's products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. (c) 2009 Atmel Corporation. All rights reserved. Atmel(R), Atmel logo and combinations thereof AVR(R), AVR (R) logo and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. 7799CS-AVR-12/09 |
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