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ST
Sitronix
Main Features
l l l Operation Voltage Range: O 2.7V to 5.5V Support 8-bit, 4-bit and serial bus MPU interface 64 x 16-bit display RAM (DDRAM) O Supports 16 words x 4 lines (Max) O LCD display range 16 words x 2 lines 64 x 256-bit Graphic Display RAM (GDRAM) 2M-bits Character Generation ROM (CGROM): Support 8192 Chinese words (16x16 dot matrix) 16K-bit half-width Character Generation ROM (HCGROM): Supports 126 characters (16x8 dot matrix) 32-common x 64-segment (2 lines of character) LCD drivers Automatic power on reset (POR) External reset pin (XRESET) With the extension segment drivers, the display area can up to 16x2 lines Built-in RC oscillator: Frequency is adjusted by an external resistor l l l l
ST7920
Chinese Fonts built in LCD controller/driver
Low power consumption design O Normal mode (450uA Typ VDD=5V) O Standby mode (30uA Max VDD=5V) VLCD (V0 to VSS): max 7V Graphic and character mixed display mode Multiple instructions: O Display Clear O Return Home O Display ON/OFF O Cursor ON/OFF O Display Character Blink O Cursor Shift O Display Shift O Vertical Line Scroll O Reverse Display (by line) O Standby Mode Built-in voltage booster (2 times) VOUT: max 7V 1/33 Duty (with ICON)
l l l
l l l l l
l l
Function Description
ST7920 LCD controller/driver IC can display alphabets, numbers, Chinese fonts and self-defined characters. It supports 3 kinds of bus interface, namely 8-bit, 4-bit and serial. All functions, including display RAM, Character Generation ROM, LCD display drivers and control circuits are all in a one-chip solution. With a minimum system configuration, a Chinese character display system can be easily achieved. ST7920 includes character ROM with 8192 16x16 dots Chinese fonts and 126 16x8 dots half-width alphanumerical fonts. Besides, it supports 64x256 dots graphic display area for graphic display (GDRAM). Mix-mode display with both character and graphic data is possible. ST7920 has built-in CGRAM and provide 4 sets software programmable 16x16 fonts. ST7920 has wide operating voltage range (2.7V to 5.5V). It also has low power consumption. So ST7920 is suitable for battery-powered portable device. ST7920 LCD driver consists of 32-common and 64-segment. Company with the extension segment driver (ST7921) ST7920 can support up to 32-common x 256-segment display. Part Number ST7920-0A ST7920-0B ST7920-0C ST7920-0F Font Code BIG-5 Code Set (Traditional Chinese) GB Code Set (Simplified Chinese) Chinese (Traditional/Simplified) & Japanese Chinese (Traditional/Simplified), Japanese & Korean
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ST7920 Specification Reversion History Version
C1.7
Date
2000/12/15 1. 2. 3. 4. 1. 2. 3. 4. 5. 6. 1. 2. 3. 4. 5.
Description
VCC changed to VDD. VLCD changed from VCC-V5 to V0-VSS. DC characteristics input High voltage (Vih) changed to 0.7VDD. DC characteristics output High voltage (Voh) changed to 0.8VDD. Chip Size changed. ICON 256 dots changed to 240 dots. XOFF normal high sleep Low changed to normal low sleep High. Added XOFF application. Modified application of ST7920: PIN 4~6 are floating. (PIN 4~6 are test pin) Modified voltage doubler CAP1P, CAP1M, CAP2M capacitors polarity Icon RAM TABLE changed. (TABLE-6) Booster description modified. (PAGE-29) AC Characteristics modified. Added 2Line 16 Chinese Word (32Com X 256Seg) application circuit. Added oscillation resistor's relation to power consumption and frequency.
C1.8
2001/03/01
C1.9
2001/05/28
C2.0 V2.0 V2.0c V2.0d V3.0 V3.1 V3.2 V3.3 V3.4 V3.5 V3.6 V3.7 V3.8 V3.9 V4.0
2001/07/03 2001/08/17 2001/10/18 2002/05/09 2002/10/11 2003/04/11 2003/09/09 2004/03/29 2005/5/24 2005/5/24 2005/6/6 2007/7/24 2007/12/20 2008/3/3 2008/8/18
1. Added Register initial values. 2. Voltage booster CAP1M CAP1P polarity changed (PAGE-30). 1. Modified Table 7 (PAGE-14). 2. Change to English version. 1. Modified page-38 Serial interface timing diagram. 1. Add the standard code (Japan, GB code, BIG-5 code). 1. Delete sleep mode function. 1. Modified GDRAM Address (AC5...AC0, 00h...3Fh). 1. Add the CGROM and HCGROM test application circuit. 1. Updat the using method for ICON. 1. ICON no used. 1. Add VOUT voltage limitation. 2. Remove IRAM related descriptions. 1. Fix the check sum count number on Page 28~30. 655360->655362, 10240->10242. 2. Modify the description about serial interface. 1. Add CGROM/HCGROM checksum operation time. 1. Add "Clear DDRAM" step before check sum process. 1. Modify 4-bit initial sequence. 1. Add Font Code "0F" at Page 1. 2. Modify the description of Font Code Table at Page 1.
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ST7920
System Block Diagram
RESI Reset Circuit PSB
RESO
CL1 CL2 M Timing Generator DOUT
CLK
RS RW E
Instruction Register (IR) MPU Interface Instruction Decoder
Display Data RAM (DDRAM) 64 x 16 bits
33/49-bit shift register
COM1 to Common COM32 Signal Driver
SEG1 to SEG64 64-bit shift register 64-bit latch circuit Segment Signal Driver
DB4 to DB7 Input/ Output Buffer Data Register (DR) Busy Flag
Address Counter
DB0 to DB3
LCD Drive Voltage Selector
Graphic RAM (GDRAM) 1024 x 16 bits
Half size Character ROM (HCGROM) 1024x16 bits
Character Generator RAM (CGRAM) 1024 bits
Character Generator ROM (CGROM) 2M bits
Cursor Blink Scroll Controller
Vss
Parallel/Serial converter and Attribute Circuit
VDD XOFF XRESET V0 V1 V2 V3 V4
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Pad Diagram
30 1
31
ST7920
136
"ST7920
(0,0)
99 68
1
69 98
Origin: center of chip Chip size: 5305 X 4074 Pad pitch: 125
Coordinates: from pad center Pad open: 90 X 90 unit: m
* Chip substrate must connect to VSS
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PAD Coordinates
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Name V0 V1 V2 CLK TT1 TT2 V3 V4 VSS VDD XRESET CL1 CL2 VDD M DOUT RS RW E VSS OSC1 OSC2 PSB D0 D1 D2 D3 D4 D5 D6 D7 XOFF VOUT CAP3M CAP1P CAP1M CAP2P CAP2M X -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2548 -2306 -2181 -2056 -1931 -1806 -1681 -1556 -1431 Y 1812 1688 1562 1438 1312 1188 1062 938 812 688 562 438 312 188 62 -62 -188 -312 -438 -562 -688 -812 -938 -1062 -1188 -1312 -1438 -1562 -1688 -1812 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 No. 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 Name VD2 C[1] C[2] C[3] C[4] C[5] C[6] C[7] C[8] C[9] C[10] C[11] C[12] C[13] C[14] C[15] C[16] C[17] C[18] C[19] C[20] C[21] C[22] C[23] C[24] C[25] C[26] C[27] C[28] C[29] C[30] C[31] C[32] C[33] Not use S[64] S[63] S[62] S[61] X -1306 -1181 -1056 -931 -806 -681 -556 -431 -306 -181 -56 69 194 319 444 569 694 819 944 1069 1194 1319 1444 1569 1694 1819 1944 2069 2194 2319 2548 2548 2548 2548 2548 2548 2548 2548 (Unit: um) Y -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1933 -1812 -1688 -1562 -1438 -1312 -1188 -1062 -938
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No. 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 Name S[60] S[59] S[58] S[57] S[56] S[55] S[54] S[53] S[52] S[51] S[50] S[49] S[48] S[47] S[46] S[45] S[44] S[43] S[42] S[41] S[40] S[39] S[38] S[37] S[36] S[35] S[34] S[33] S[32] S[31] S[30] S[29] S[28] S[27] S[26] S[25] S[24] S[23] S[22] X 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2548 2319 2194 2069 1944 1819 1694 1569 1444 1319 1194 1069 944 819 694 569 444 319 Y -812 -688 -562 -438 -312 -188 -62 62 188 312 438 562 688 812 938 1062 1188 1312 1438 1562 1688 1812 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 No. 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 Name S[21] S[20] S[19] S[18] S[17] S[16] S[15] S[14] S[13] S[12] S[11] S[10] S[9] S[8] S[7] S[6] S[5] S[4] S[3] S[2] S[1] X 194 69 -56 -181 -306 -431 -556 -681 -806 -931 -1056 -1181 -1306 -1431 -1556 -1681 -1806 -1931 -2056 -2181 -2306 Y 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933 1933
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Pin Description Name
XRESET PSB
No.
11 23
I/O
I I
Connects to

Function
System reset input (low active). Interface selection: 0: serial mode; 1: 8/4-bit parallel bus mode. Parallel Mode: Register select. 0: Select instruction register (write) or busy flag, address counter (read); 1: Select data register (write/read). Serial mode: Chip select. 1: chip enabled; 0: chip disabled. When chip is disabled, SID and SCLK should be set as "H" or "L". Transcient of SID and SCLK is not allowed. Parallel Mode: Read/Write control. 0: Write; 1: Read. Serial Mode: Sserial data input. Parallel Mode: 1: Enable trigger. Serial Mode: Serial clock. Higher nibble data bus of 8-bit interface and data bus for 4-bit interface Lower nibble data bus of 8-bit interface. Latch signal for extension segment drivers. Shift clock for extension segment drivers. AC signal for extension segment drivers voltage inversion. Data output for extension segment drivers. Common signals. Segment signals.
RS(CS*)
17
I
MPU
RW(SID*)
18
I
MPU
E(SCLK*) D4 to D7 D0 to D3 CL1 CL2 M DOUT COM1 to COM32 SEG1 to SEG64 V0 to V4
19 28~31 24~27 12 13 15 16 40~71 136~73 1~3,7,8
I I/O I/O O O O O O O
MPU MPU MPU Extension segment drv. Extension segment drv. Extension segment drv. Extension segment drv. LCD LCD
LCD bias voltage. V0 ~ V4 7V. VDD 10,14 I Power VDD : 2.7V to 5.5V. Vss 9,20 I Power VSS: 0V. Using internal oscillator: 5.0V R=33K; OSC1, 21,22 I, O Resistors 2.7V R=18K. OSC2 Using external clock: Use OSC1 as external clock input. LCD voltage doubler output. VOUT 33 O Resistors VOUT 7V. *Note: The OSC pin must have the shortest wiring pattern of all other pins. To prevent noise from other signal lines, it should also be enclosed by the largest GND pattern. Poor anti-noise characteristics on the OSC line will result in malfunction, or adversely affect the clock's duty ratio.
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Pin Description (continued) Name
CAP3M CAP1P CAP1M CAP2M XOFF CAP2P C[33]
No.
34 35 36 38 32 37 72
I/O
I/O O O
Connects to
Capacitors
Description
Capacitor pins for voltage doubler Voltage 7V. Reserved (no connection). Reserved (no connection). Reserved (no connection). Voltage doubler reference voltage. If use internal voltage doubler, please make sure that: l VD2 3.5V or l VOUT 7V and CAP3M 7V. For CGROM/HCGROM checksum. Refer to checksum application.
VD2
39
I
Reference voltage
CLK TT1 TT2
Note: 1. 2.
4 5 6
I

7V>=VOUT>=V0>=V1>=V2>=V3>=V4 must be maintained Two clock options: As shown below.
OSC1 R
OSC2 Clock input
OSC1
OSC2
R=33K (VDD=5.0V) R=18K (VDD=2.7V)
External Resistor vs. Current (VDD=5V)
800 700 600 500 Iss (uA) 400 300 200 100 0 5 15 25 40 60 Resistor(K) 80 100 900 800 700
External Resistor vs. Frequency (VDD=5V)
Frequency(KHz)
600 500 400 300 200 100 0 5 15 25 40 60 80 100
Resistor(K)
3.
When using voltage doubler (VOUT), it is recommended that the sum of those divide resistors (R1~R5) should be larger than 20K Ohm. So that the voltage doubler can provide sufficient power.
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Voltage Doubler
Voltage Doubler Reference Voltage
Vss CAP1M CAP1P CAP2M CAP2P CAP3M VOUT VOUT
VD2
VOUT vs. VD2
10 9 8 7
Do not operate in this area.
VOUT (V)
6 5 4 3 2 1 0 5 4.8 4.6 4.4 4.2 4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 1.8
VD2 (V)
Voltage Doubler mode: VD2 & Vout output characteristic
Notes: l l l Total resistance of the Follower deviding resistors should larger than 20K Ohm. Booster Capacitor uses 4.7uF Panel size: 80mm x 28mm (check display)
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Function Description
System interface ST7920 supports 3 kinds of bus interface to communicate with MPU: 8-bit parallel, 4-bit parallel and clock synchronized serial interface. Parallel interface is selected by PSB="1" and serial interface is by PSB="0". 8-bit / 4-bit interface is selected by function set instruction DL bit. Two 8-bit registers (Data Register DR and Instruction Register IR) are used in ST7920 to access DRAM or Register. Data Register (DR) can access DDRAM, CGRAM and GDRAM through the address pointer implemented by Address Counter (AC). Instruction Register (IR) stores the instruction sent by MPU to ST7920. 4 kinds of parallel interface access mode can be selected through RS and RW: RS RW Description L L MPU write instruction to instruction register (IR) L H MPU read busy flag (BF) and address counter (AC) H L MPU write data to data register (DR) H H MPU read data from data register (DR) * The serial interface access modes do not have Read operation. Busy Flag (BF) ST7920 needs a process time for any received instruction. Before finishing the received instruction, any further instruction is not accepted. The process time of each instruction is not equal and the internal process is finished or not can be determined by the BF. Internal operation is in progress while BF="1", that means ST7920 is in busy state. No further instructions will be accepted until BF="0". MPU must check BF to determine whether the internal operation is finished or not before issuing instruction. Address Counter (AC) Address Counter (AC) is used as the address pointer of DDRAM, CGRAM and GDRAM. (AC) can be set by instruction. After that, accesses (Read/Write operations) to the memories, such as DDRAM, CGRAM or GDRAM, (AC) will be increased or decreased by 1 (according to the setting in "Entry Mode Set" Register). When RS="0", RW="1" and E="1" the value of (AC) will be output to DB6~DB0. Character Generation ROM (CGROM) and Half-width Character Generation ROM (HCGROM) ST7920 is built in a Character Generation ROM (CGROM) to provide 8192 16x16 character fonts and a Half-width Character Generation ROM to provide 126 8x16 alphanumeric characters. It is easy to support multi-language applications such as Chinese and English. Two consecutive bytes are used to specify one 16x16 character or two 8x16 half-width characters. Character codes are written into DDRAM and the corresponding fonts are mapped from CGROM or HCGROM to the display drivers. Character Generation RAM (CGRAM) ST7920 is built in a Character Generation RAM (CGRAM) to support user-defined fonts. Four sets of 16x16 bit-maped RAM spaces are available. These user-defined fonts are displayed the same ways as CGROM fonts by writing the related character code into the DDRAM.
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Display Data RAM (DDRAM) There are 64x2 bytes RAM spaces for the Display Data RAM. It can store display data such as 16 characters (16x16) by 4 lines or 32 characters (8x16) by 4 lines. However, only 2 character-lines (maximum 32 common outputs) can be displayed at one time. Character codes stored in DDRAM will refer to the fonts specified by CGROM, HCGROM and CGRAM. ST7920 can display half-width HCGROM fonts, user-defined CGRAM fonts and full 16x16 CGROM fonts. The character codes in 0000H~0006H will use user-defined fonts in CGRAM. The character codes in 02H~7FH will use half-width alpha numeric fonts. The character code larger than A1H will be treated as 16x16 fonts and will be combined with the next byte automatically. The 16x16 BIG5 fonts are stored in A140H~D75FH while the 16x16 GB fonts are stored in A1A0H~F7FFH. In short: 1. To display HCGROM fonts: Write 2 bytes of data into DDRAM to display two 8x16 fonts. Each byte represents 1 character. The data is among 02H~7FH. 2. To display CGRAM fonts: Write 2 bytes of data into DDRAM to display one 16x16 font. Only 0000H, 0002H, 0004H and 0006H are acceptable. 3. To display CGROM fonts: Write 2 bytes of data into DDRAM to display one 16x16 font. A140H~D75FH are BIG5 code, A1A0H~F7FFH are GB code. The higher byte (D15~D8) is written first and the lower byte (D7~D0) is the next. Please refer to Table 5 for the relationship between DDRAM and the address/data of CGRAM. CGRAM fonts and CGROM fonts can only be displayed in the start position of each address. (Refer toTable 4) 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 80 HLHLHLHLHLHLHLHLHLHLHLHLHLHLHLHL Si tronix ST7920 ( .. ) ... Table 4 Incorrect start position
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Graphic RAM (GDRAM) Graphic Display RAM has 64x256 bits bit-mapped memory space. GDRAM address is set by writing 2 consecutive bytes of vertical address and horizontal address. Two-byte data (16 bits) configures one GDRAM horizontal address. The Address Counter (AC) will be increased by one automatically after receiving the 16-bit data for the next operation. After the horizontal address reaching 0FH, the horizontal address will be set to 00H and the vertical address will not change. The procedure is summarized below: 1. Set vertical address (Y) for GDRAM 2. Set horizontal address (X) for GDRAM 3. Write D15~D8 to GDRAM (first byte) 4. Write D7~D0 to GDRAM (second byte) Please refer to Table 7 for Graphic Display RAM mapping. LCD driver ST7920 embedded LCD driver has 33 commons and 64 segments to drive the LCD panel. Segment data from CGRAM, CGROM and HCGROM are shifted into the 64 bits segment latche to display. Extended segment driver (ST7921) can be used to extend the segment outputs upto 256 segments.
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DDRAM data CGRAM CGRAM data CGRAM data (char. code) Addr. (higher byte) (lower byte) B B B B B B B BB B DDDDDDDDDDDDDDDD B15~ B4 3 2 1 0 5 4 3 2 1 0 1 1 1 1 1 1 9 8 7 6 5 4 3 2 1 0 543210 00000000010001100000 00011111111001000000 00100001000001000100 00110001000001111110 01000010010010000100 01010011110010000100 01100110010101001000 01111010011001001000 0 X 00 X 00 10000010010001010000 10010010010000010000 10100010010000100000 10110011110000100000 11000010010001000000 11010000000010000000 11100000000100000000 11110000000000000000 00000000110000000110 00010001101000000100 00100010000100110100 00110101110110100100 01001000000010100100 01010111111100100100 01100100000100100100 01110111111100100100 0 X 01 X 01 10000100000100100100 10010111111100100100 10100100000000100100 10110111111110 00100 11001010000010100100 11011011111110011100 11101010000010001000 11110000000000000000 Table 5: DDRAM data (character code) vs. CGRAM data/address map
Note: 1. 2. 3. 4. DDRAM data (character code) bit1 and bit2 are identical with CGRAM address bit4 and bit5. CGRAM address bit0 to bit3 specify total 16 rows. Row-16 is for cursor display. The data in Row-16 will be logically OR to the cursor. CGRAM data for each address is 16 bits. To select the CGRAM font, the bit4 through bit15 of DDRAM data must be "0" while bit0 and bit3 are "don't care".
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Table 6
16x8 half-width characters
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GDRAM Horizontal address X
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
1
...........
15

GDRAM Vertical address Y
...........
...........
b15 b14 b13
...........
b0
Table 7
GDRAM display coordinates and corresponding address
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Instructions
ST7920 offers basic instruction set and extended instruction set: Instruction Set 1: (RE=0: Basic Instruction) Inst.
Display Clear Return Home Entry Mode Set Display Control Cursor Display Control Function Set Set CGRAM Address. Set DDRAM Address. Read Busy Flag (BF) & AC. Write RAM Read RAM 1 1 0 1 D7 D7 D6 D6 D5 D5 D4 D4 D3 D3 D2 D2 D1 D1 D0 D0 0 1 BF AC6 AC5 AC4 AC3 AC2 AC1 AC0 0 0 1 0 AC6 AC5 AC4 AC3 AC2 AC1 AC0 0 0 0 1 0 RE 0 0 0 0 0 1 S/C R/L X X 0 0 0 0 0 0 0 0 0 0 0 0
Code
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 I/D 1 X S
Description
Fill DDRAM with "20H" and set DDRAM address counter (AC) to "00H". Set DDRAM address counter (AC) to "00H", and put cursor to origin the content of DDRAM are not changed Set cursor position and display shift when doing write or read operation D=1: Display ON C=1: Cursor ON B=1: Character Blink ON Cursor position and display shift control; the content of DDRAM are not changed DL=1 8-bit interface
Exec time (540KHZ) 1.6 ms 72 us 72 us
0
0
0
0
0
0
1
D
C
B
72 us
72 us
0
0
0
0
1
DL
X
X
X
DL=0 4-bit interface RE=1: extended instruction RE=0: basic instruction Set CGRAM address to address counter (AC)
72 us
AC5 AC4 AC3 AC2 AC1 AC0 Make sure that in extended instruction SR=0 (scroll or RAM address select) Set DDRAM address to address counter (AC) AC6 is fixed to 0 Read busy flag (BF) for completion of internal operation, also Read out the value of address counter (AC) Write data to internal RAM (DDRAM/CGRAM/GDRAM) Read data from internal RAM (DDRAM/CGRAM/GDRAM)
72 us
72 us
0 us
72 us 72 us
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Instruction set 2: (RE=1: extended instruction) Inst.
Standby Scroll or RAM Address. Select Reverse (by line) Select 1 out of 4 line (in DDRAM) and decide whether to 0 0 0 0 0 0 0 1 R1 R0 reverse the display by toggling this instruction R1,R0 initial value is 0,0 DL=1 :8-bit interface Extended Function Set 0 0 0 0 1 DL X DL=0 :4-bit interface 1 RE G 0 RE=1: extended instruction set RE=0: basic instruction set G=1 :graphic display ON G=0 :graphic display OFF Set Scroll Address Set Graphic Display RAM Address 0 0 1 0 0 0 0 AC3 AC2 AC1 AC0 AC5 AC4 AC3 AC2 AC1 AC0 0 0 0 1 AC5 AC4 AC3 AC2 AC1 AC0 SR=1: AC5~AC0 the address of vertical scroll Set GDRAM address to address counter (AC) Set the vertical address first and followed the horizontal address by consecutive writings Vertical address range: AC5...AC0 Horizontal address range: AC3...AC0 72 us 72 us 72 us 72 us 0 0 0 0 0 0 0 0 1 SR SR=1: enable vertical scroll position SR=0: enable CGRAM address (basic instruction) 72 us 0 0 0 0
Code
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 1
Description
Enter standby mode, any other instruction can terminate. COM1...32 are halted.
Exec time (540KHZ) 72 us
Note: 1. 2. Make sure that ST7920 is not in busy state by reading the busy flag before sending instruction or data. If using delay loop instead, please make sure the delay time is enough. Please refer to the instruction execution time. "RE" is the selection bit of basic and extended instruction set. After setting the RE bit, the value will be kept. So that the software doesn't have to set RE every time when using the same instruction set.
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Initial Setting (Register flag) (RE=0: basic instruction) Inst.
Entry Mode Set 0 0 0 0 0 0 1 D 0 0 0 0 0 0 1 S/C R/L X 0 0 0 0 1 DL 1 X X 0 RE 0 X X 8-bit MPU interface , basic instruction set 0 0 0 0
Code
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 1 I/D 1 C 0 X S
Description
Cursor move to right ,DDRAM address counter (AC) plus 1 0 B Display, cursor and blink are ALL OFF 0 X No cursor or display shift operation
Display Control
CURSOR DISPLAY SHIFT
FUNCTION SET
Initial Setting (Register flag) (RE=1: extended instruction set) Inst.
SCROLL OR RAM ADDR. SELECT 0 REVERSE 0 EXTENDED FUNCTION SET 0 0 0 0 1 DL X 1 RE G 0 0 0 Graphic display OFF 0 0 0 0 0 0 1 R1 R0 Begin with normal and toggle to reverse 0 0 0 0 0
Code
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 1 SR
Description
Allow vertical scroll or set CGRAM address
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Description of basic instruction set l Display Clear
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
0
0
0
1
l
This instruction will change the following items: 1. Fill DDRAM with "20H"(space code). 2. Set DDRAM address counter (AC) to"00H". 3. Set Entry Mode I/D bit to be "1". Cursor moves right and AC adds 1 after write or read operation. Return Home
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
0
0
1
X
l
Set address counter (AC) to "00H". Cursor moves to origin. Then content of DDRAM is not changed. Enry Mode Set
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
0
1
I/D
S
Set the cursor movement and display shift direction when doing write or read operation. I/D: Address Counter Control: (Increase/Decrease) When I/D = "1", cursor moves right, address counter (AC) is increased by 1. When I/D = "0", cursor moves left, address counter (AC) is decreased by 1. S: Display Shift Control: (Shift Left/Right) S I/D DESCRIPTION H H Entire display shift left by 1 H L Entire display shift right by 1
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2008/08/18
ST7920
l Display Control
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
1
D
C
B
Controls display, cursor and blink ON/OFF. D: Display ON/OFF control bit When D = "1", display ON When D = "0", display OFF, the content of DDRAM is not changed C: Cursor ON/OFF control bit When C = "1", cursor ON. When C = "0", cursor OFF. B: Character Blink ON/OFF control bit When B = "1", cursor position blink ON. Then display data (character) in cursor position will blink. When B = "0", cursor position blink OFF l Cursor/Display Shift Control
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
1
S/C R/L
X
X
This instruction configures the cursor moving direction or the display shifting direction. The content of DDRAM is not changed. S/C R/L Description AC Value L L Cursor moves left by 1 position AC=AC-1 L H Cursor moves right by 1 position AC=AC+1 H L Display shift left by 1, cursor also follows to shift. AC=AC H H Display shift right by 1, cursor also follows to shift. AC=AC
V4.0
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2008/08/18
ST7920
l Function Set
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
1
DL
X
RE
X
X
DL: 4/8-bit interface control bit When DL = "1", 8-bit MPU bus interface When DL = "0", 4-bit MPU bus interface RE: extended instruction set control bit When RE = "1", extended instruction set When RE = "0", basic instruction set In same instruction cannot alter DL and RE at once. Make sure that change DL first then RE. l Set CGRAM Address
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 Code
0
0
1
AC5 AC4 AC3 AC2 AC1 AC0
Set CGRAM address into address counter (AC) AC range is 00H...3FH Make sure that in extended instruction SR=0 (scroll address or RAM address select) l Set DDRAM Address
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 Code
0
1
AC6 AC5 AC4 AC3 AC2 AC1 AC0
Set DDRAM address into address counter (AC). First line AC range is 80H...8FH Second line AC range is 90H...9FH Third line AC range is A0H...AFH Fourth line AC range is B0H...BFH Please note that only 2 lines can be display with one ST7920. l Read Busy Flag (BF) and Address
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 Code
1
BF
AC6 AC5 AC4 AC3 AC2 AC1 AC0
Read busy flag (BF) can check whether the internal operation is finished or not. At the same time, the value of address counter (AC) is also read. When BF = "1", further instruction(s) will not be accepted until BF = "0".
V4.0
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2008/08/18
ST7920
l Write Data to RAM
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
1
0
D7 D6 D5 D4 D3 D2 D1 D0
Write data to the internal RAM and increase/decrease the (AC) by 1 Each RAM address (CGRAM, DDRAM and GDRAM...) must write 2 consecutive bytes for 16-bit data. After receiving the second byte, the address counter will increase or decrease by 1 according to the entry mode set control bit. l Read RAM Data
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
1
1
D7 D6 D5 D4 D3 D2 D1 D0
Read data from the internal RAM and increase/decrease the (AC) by 1 After the operation mode changed to Read (CGRAM, DDRAM and GDRAM...), a "Dummy Read" is required. There is no need to add a "Dummy Read" for the following bytes unless a new address set instruction is issued.
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ST7920
Description of extended instruction set l Standby
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
0
0
0
1
This Instruction will set ST7920 entering the standby mode. Any other instruction follows this instruction will terminate the standby mode. The content of DDRAM remains the same. l Vertical Scroll or RAM Address Select
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
0
0
1
SR
When SR = "1", the Vertical Scroll mode is enabled. When SR = "0", "Set CGRAM Address" instruction (basic instruction) is enabled. l Reverse
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
0
0
0
1
R1 R0
Select 1 out of 4 lines to reverse the display and to toggle the reverse condition by repeating this instruction. R1, R0 initial vale is 00. The first time issuing this instruction, the display will be reversed while the second time will return the display become normal. R1 L L H H R0 L H L H Description First line normal or reverse Second line normal or reverse Third line normal or reverse Fourth line normal or reverse
Please note that only 2 lines out of 4 lines of display data can be displayed with one ST7920.
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2008/08/18
ST7920
l Extended Function Set
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Code
0
0
0
0
1
DL
X
RE
G
X
DL: 4/8-bit interface control bit When DL = "1", 8-bit MPU interface. When DL = "0", 4-bit MPU interface. RE: extended instruction set control bit When RE = "1", extended instruction set When RE = "0", basic instruction set G: Graphic display control bit When G = "1", Graphic Display ON When G = "0", Graphic Display OFF In same instruction cannot alter DL, RE and G at once. Make sure that change DL or G first and then RE. l Set Scroll Address
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 Code
0
0
1
AC5 AC4 AC3 AC2 AC1 AC0
SR=1: AC5~AC0 is vertical scroll displacement address l Set Graphic RAM Address
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 Code
0
1
0
AC5 AC4 AC3 AC2 AC1 AC0
RS
RW
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0 Code
0
1
0
0
0
AC3 AC2 AC1 AC0
Set GDRAM address into address counter (AC). This is a 2-byte instruction. The first instruction sets the vertical address while the second one sets the horizontal address (write 2 consecutive bytes to complete the vertical and horizontal address setting). Vertical address range is AC5...AC0 Horizontal address range is AC3...AC0 The address counter (AC) of graphic RAM (GRAM) will be increased automatically after the vertical and horizontal addresses are set. After horizontal address is increased upto 0FH, it will automatically return to 00H. However, the vertical address will not increase as the result of the same action.
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ST7920
Parallel interface:
ST7920 is in parallel mode by pulling up PSB pin. ST7920 can select 8-bit or 4-bit bus interface by setting the DL control bit in "Function Set" instruction. MPU can control RS, RW, E and DB0...DB7 pins to complete the data transmission. In 4-bit transfer mode, every 8-bit data or instruction is separated into 2 parts. The higher 4 bits (bit-7~bit-4) data will be transfered first through data pins (DB7~DB4). The lower 4 bits (bit-3~bit-0) data will be transfered second through data pins (DB7~DB4). The (DB3~DB0) data pins are not used during 4-bit transfer mode.
RS RW E DB0-DB7
Instruction write Dummy read RAM read
Timing Diagram of 8-bit Parallel Bus Mode Data Transfer
RS RW E
Upper Lower Upper Lower Upper Lower
DB0-DB7
4-bit
4-bit
4-bit
4-bit
4-bit
4-bit
Instruction write
Dummy read
RAM read
Timing Diagram of 4-bit Parallel Bus Mode Data Transfer
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ST7920
Serial interface:
ST7920 is in serial interface mode when pulling down PSB pin. Two pins (SCLK and SID) are used to complete the data transfer. Only write data is available in the serial interface mode. When chip select (CS) is low, ST7920 serial clock counter and serial data will be reset. Serial transfer counter is set to the first bit and data register is cleared. After CS is "L", any further change on SID or SCLK is not allowed. It is recommended to keep SCLK at "L" and SID at the last status before set CS to "L". For a minimal system with only one ST7920 and one MPU, only SCLK and SID pins are necessary. CS pin should pull to high. ST7920's serial clock (SCLK) is asynchronous to the internal clock and is generated by MPU. When multiple instruction/data is transferred, the instruction execution time must be considered. MPU must wait till the previous instruction is finished and then send the next instruction. ST7920 has no internal instruction buffer area. When starting a transmission, a start byte is required. It consists of 5 consecutive "1" (sync character). Serial transfer counter will be reset and synchronized. Followed by 2-bit flag that indicates: read/write (RW) and register/data selected (RS) operation. Last 4 bits are filled by "0". After receiving the sync character, RW and RS bits, every 8 bits instruction/data will be separated into 2 groups. Higher 4 bits (DB7~DB4) will be placed in the first section followed by 4 "0"s. And lower 4 bits (DB3~DB0) will be placed in the second section followed by 4 "0"s.
CS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SCLK SID
1 1 1 1 1 RW RS 0 D7 D6 D5 D4 0 0 0 0 D3 D2 D1 D0 0 0 0 0
Synchronizing Bit string
Higher data 1st byte
Lower data 2nd byte
Timing Diagram of Serial Mode Data Transfer
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2008/08/18
ST7920
8051 demo program for serial interface
;-------------------------------------------------------------; Write data from A into INSTRUCTION Register ;-------------------------------------------------------------WRINS: SETB CS SETB SID ; SID = 1 CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.7 ; SID = A.7 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.6 ; SID = A.6 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.5 ; SID = A.5 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.4 ; SID = A.4 SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.3 ; SID = A.3 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.2 ; SID = A.2 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.1 ; SID = A.1 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.0 ; SID = A.0 SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK CLR CS CALL DLY8 RET ;------------------------------------------------; Write data from A into DATA Register ;------------------------------------------------WRDATA: SETB CS SETB SID ; SID = 1 CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SID ; SID = 1 SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.7 ; SID = A.7 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.6 ; SID = A.6 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.5 ; SID = A.5 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.4 ; SID = A.4 SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.3 ; SID = A.3 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.2 ; SID = A.2 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.1 ; SID = A.1 SETB SCLK ; READ DATA FROM SID CLR SCLK MOVBIT SID, A.0 ; SID = A.0 SETB SCLK ; READ DATA FROM SID CLR SCLK CLR SID ; SID = 0 SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK SETB SCLK ; READ DATA FROM SID CLR SCLK CLR CS CALL DLY8 RET
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ST7920
Application circuit for testing CGROM and HCGROM: We can use the function of "CHECK SUM" to check the CGROM is right or error. See the following notes: Useing IC Pad (Pin4aCLK, Pin5aTT1, Pin6aTT2) to do the "CHECK SUM" function. The application circuit is at Page49. Timing Diagram for checking CGROM (TT1=0, TT2=1) The ST7920 check sum process: (DDRAM must be cleared by 0x00 before this process) In the first place: Resetting the internal counter (set TT1 and TT2 to Height) In the second place: Setting CGROM mode (set TT1 to Low, TT2 to Height). In the third place: CLK starts to count 655362 times. In the final place: Finishing the counting, read the last four bytes to CHECK SUM (reading only when the CLK is Height). ST7920 check sum circuit: Data is available when CLK is height; if CLK is low then the data is always FFH. The last four bytes are Y0, Y1, Y2, and Y3.
The fatest execution time is: tCYC=1us (1MHz at 5V). The table below is a comparing table of CGROM for different versions. Version (Font) 1 2 3 Big5 (0A) GB (0B) 0C CGROM Last four bytes Y0 38 9D FD Y1 88 81 6F Y2 CC 79 B5 Y3 F1 29 85
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ST7920
Timing Diagram for checking HCGROM (TT1=1, TT2=0) The ST7920 check sum process: (DDRAM must be cleared by 0x00 before this process) In the first place: Resetting the internal counter (set TT1 and TT2 to Height) In the second place: Setting CGROM mode (set TT1 to Height, TT2 to Low). In the third place: CLK starts to count 10242 times. In the final place: Finishing the counting, read the last four bytes to CHECK SUM (reading only when the CLK is Height). ST7920 check sum circuit: Data is available when CLK is height; if CLK is low then the data is always FFH. The last four bytes are Y0, Y1, Y2, and Y3.
The fatest execution time is: tCYC=2us (0.5MHz at 5V). The table below is a comparing table of HCGROM for different versions. Version (Font) 1 2 3 Big5 (0A) GB (0B) 0C HCGROM last four bytes Y0 B5 B5 B5 Y1 11 11 11 Y2 B5 B5 B5 Y3 11 11 11
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ST7920
Testing Step: 1. Clear whole DDRAM area by writing data 0x00. 2. Composing TT1 and TT2 to make the `Reset' action, and clear the internal counter. 3. Selecting the test mode by setting TT1 and TT2 (CGROM or HCGROM). 4. After setp1 and setp2, entering some impulse signals through Pin4 (CLK). 5. Reading the CHECK SUM data through D0 to D7. 6. Comparing CHECK SUM with the Code Table (upper table) to check if the data is correct or not.
TT1 1 0 1
TT2 1 1 0
No. of counts -655362 10242
Status RESET CGROM HGROM
Test process flow:
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ST7920
8051 CGROMHCGROM illustrative test program
;*******************************; ;* CHECK_ROM *; ;*******************************; ;*******************************; ;* Definition of outside Pin *; ;*******************************; REG P3.5 ; REG P3.0 ; REG P3.1 ; REG P3.2 ;CHECK CGROM FLAG REG P3.3 ;CHECK HCGROM FLAG REG P3.4 ;ERROR FLAG ;*******************************; ;* Definition of internal RAM *; ;*******************************; EQU 6FH ; EQU 20H ; ;*******************************; ; Interrupt set *; ;*******************************; ORG 00H ; AJMP RESET ; ;*******************************; ;* PROGRAM START *; ;*******************************; MOV SP,#STACK ; MOV P1,#FFH ; MOV P3,#FFH ; ;*******************************; ;* CHECK_CGROM *; ;*******************************; ;*******************************; ;* Initial DDRAM *; ;*******************************; CALL WR0x00 ;Write 0x00 to whole DDRAM ;*******************************; ;* Initial setting *; ;*******************************; SETB TT1 ; SETB TT2 ;TT1,TT2 SET HIGH (RESET) CALL DELAY_100US ;Wait Reset 100us CLR TT1 ;TT1=LOW TT2=HIGH ( CHECK CGROM) SETB CLK ; CALL DELAY_100US ; ;*******************************; ;* start counter *; ;*******************************; MOV R3,#9 ; MOV R2,#0 ;<---MOV R1,#0 ; | CLR CLK ; | SETB CLK ; | DJNZ R1,CN2 ; | DJNZ R2,CN3 ; | DJNZ R3,CN4 ; | ; | MOV R3,#0 ; | MOV R2,#255 ; | CLR CLK ; | SETB CLK ; | DJNZ R2,CN6 ; | DJNZ R3,CN5 ; | ; |
CLK TT1 TT2 TT3 TT4 TT5
STACK FUNC
RESET:
CGROM:
CN4: CN3: CN2:
CN5: CN6:
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ST7920
CN7: CN8: CN9: MOV R3,#63 ; | MOV R2,#2 ; | MOV R1,#2 ; | CLR CLK ; | SETB CLK ; | DJNZ R1,CN9 ; | DJNZ R2,CN8 ; | DJNZ R3,CN7 ; | CLR CLK ; | SETB CLK ; | CLR CLK ; | SETB CLK ;<---- Counter 655356 ;-------------------------------; CLR CLK ;Counter 655357 SETB CLK ; MOV A,P1 ;A=Y0 CJNE A,#FDH,ERRORC ;COMPARE Y0 DATA CLR CLK ;Counter 655358 SETB CLK ; MOV A,P1 ;A=Y1 CJNE A,#6FH,ERRORC ;COMPARE Y1 DATA CLR CLK ;Counter 655359 SETB CLK ; MOV A,P1 ;A=Y2 CJNE A,#B5H,ERRORC ;COMPARE Y2 DATA CLR SETB MOV CJNE CLR CLR CALL CLK CLK A,P1 A,#85H,ERRORC CLK TT3 HCGROM
;Counter 655360 ; ;A=Y3 ;COMPARE Y3 DATA ; ;IF OK CLR TT3 ; ERRORC: ; CLR TT5 ;IF CGROM CHECK ERROR CLR TT5 ;---------------------------------------; ;*******************************; ;* CHECK_HCGROM *; ;*******************************; ;*******************************; ;* Initial setting *; ;*******************************; HCGROM: SETB TT1 ; SETB TT2 ;TT1,TT2 SET HIGH (RESET) CALL DELAY_100US ;Wait Reset 100us CLR TT2 ;TT2=LOW TT1=HIGH ( CHECK HCGROM) SETB CLK ; CALL DELAY_100US ; ;*******************************; ;* start counter *; ;*******************************; MOV R3,#9 ; N4: MOV R2,#32 ;<---N3: MOV R1,#32 ; | N2: CLR CLK ; | SETB CLK ; | DJNZ R1,N2 ; | DJNZ R2,N3 ; | DJNZ R3,N4 ; | ; | MOV R3,#32 ; | N5: MOV R2,#31 ; | N6: CLR CLK ; | SETB CLK ; | DJNZ R2,N6 ; | DJNZ R3,N5 ; | ; | MOV R2,#30 ; |
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ST7920
N7: CLR CLK ; | SETB CLK ; | DJNZ R2,N7 ; | ;---------------------------------------;<---- Counter 10236 CLR CLK ;Counter 10237 SETB CLK ; MOV A,P1 ;A=Y0 CJNE A,#B5H,ERROR ;COMPARE Y0 DATA CLR CLK ;Counter 10238 SETB CLK ; MOV A,P1 ;A=Y1 CJNE A,#11H,ERROR ;COMPARE Y1 DATA CLR CLK ;Counter 10239 SETB CLK ; MOV A,P1 ;A=Y2 CJNE A,#B5H,ERROR ;COMPARE Y2 DATA CLR CLK ;Counter 10240 SETB CLK ; MOV A,P1 ;A=Y3 CJNE A,#11H,ERROR ;COMPARE Y3 DATA CLR CLK ; CLR TT4 ;IF HCGROM CHECK OK THEN CLR TT4 AJMP $ ; ERROR: ; CLR TT5 ;IF HCGROM CHECK ERROR THEN CLR TT5 AJMP $ ; ;*******************************; ;* DELAY TIME 100US *; ;*******************************; DELAY_100US ; DEL_10 MOV R6,#5 ; DEL_9 MOV R7,#3 ; DJNZ R7,$ ; DJNZ R6,DEL_9 ; RET ; END ;
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ST7920
8-bit interface: POWER ON Wait time >40ms
XRESET LOW HIGH
Function set RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 1 1 X 0 X X
Wait time >100uS Function set RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 1 1 X 0 X X
Wait time >37uS Display ON/OFF control RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 1 D C B
Wait time >100uS Display clear RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 0 0 1
Wait time >10mS Entry mode set RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 1 I/D S
Initialization end
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ST7920
4-bit interface:
POWER ON
Wait time > 40mS (for VDD stable) XRESET: LOW HIGH
Function set
RS 0 0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 1 0 X X X X 0 X 0 X X X X X X Wait time > 100S
Function set
RS 0 0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 1 0 X X X X 0 X 0 X X X X X X Wait time > 100S
Display ON/OFF Control
RS 0 0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 X X X X 0 1 D C B X X X X Wait time > 100S
Display Clear
RS 0 0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 X X X X 0 0 0 0 1 X X X X Wait time > 10mS
Entry Mode Set
RS 0 0 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 X X X X 0 0 1 I/D S X X X X
INITIALIZATION END
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ST7920
Built in voltage booster
VOUT Vss
Voltage Doubler Reference Voltage Voltage Doubler Reference Voltage
VD2
CAP1M CAP1P CAP2M CAP2P CAP3M
VD2
VSS
VOUT
VOUT
External reset timing
VDD Tres XRESET
Trw
XRESET pulse width RESET start time
Trw Tres
10us 50ns
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ST7920
LCD driving wave form (1/33 duty, 1/5 bias ) When oscillation frequency is 540KHZ, 1 clock cycle time = 1.85us 1 frame = 1.85us x 300 x 33 = 18315us=18.3ms
300 clocks 1 2 3 4 33 1 2 3 4 33 1 2 3 4 33
V0 V1 V2 COM1 V3 V4 VSS
V0 V1 V2 COM2 V3 V4 VSS
V0 V1 V2 COM33 V3 V4 VSS
SEGx off
V0 V1 V2 V3 V4 VSS
SEGx on
V0 V1 V2 V3 V4 VSS
1 frame
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ST7920
Absolute Maximum Ratings Characteristics Power Supply Voltage LCD Driver Voltage Voltage Doubler Output Input Voltage Operating Temperature Storage Temperature Symbol VDD VLCD or V0 VOUT VIN TA TSTO Value -0.3V to +6.0V -0.3V to +7.0V -0.3V to +7.0V -0.3V to VDD+0.3V -30 to + 85 -65 to + 150
DC Characteristics (TA = -30 ~ 85, VDD = 2.7 V - 4.5 V) Symbol VDD VLCD ICC VIH1 VIL1 VIH2 VIL2 VOH1 VOL1 VOH2 VOL2 ILEAK IPUP Characteristics Operating Voltage LCD Voltage Test Condition Min. 2.7 3.0 0.7VDD - 0.3 VDD - 1 0.8VDD 0.8VDD -1 22 Typ. 0.20 27 Max. 5.5 7 0.45 VDD 0.6 VDD 1.0 VDD 0.1 VDD 0.1VDD 1 32 Unit V V mA V V V V V V V V A A
V0-VSS fOSC = 530KHz, VDD=3.0V Power Supply Current Rf=18K Input High Voltage (Except OSC1) Input Low Voltage (Except OSC1) Input High Voltage (OSC1) Input Low Voltage (OSC1) Output High Voltage IOH = -0.1mA (DB0 - DB7) Output Low Voltage IOL = 0.1mA (DB0 - DB7) Output High Voltage IOH = -0.04mA (Except DB0 - DB7) Output Low Voltage IOL = 0.04mA (Except DB0 - DB7) Input Leakage VIN = 0V to VDD Current Pull Up MOS Current VDD = 3V
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ST7920
DC Characteristics (TA = -30 ~ 85, VDD = 4.5 V - 5.5 V) Symbol VDD VLCD ICC VIH1 VIL1 VIH2 VIL2 VOH1 VOL1 VOH2 VOL2 ILEAK IPUP Characteristics Operating Voltage LCD Voltage Test Condition Min. Typ. 0.45 80 Max. 5.5 7 0.75 VDD 0.6 VDD 1.0 VDD 0.4 VDD 0.1VDD 1 85 Unit V V mA V V V V V V V V A A
4.5 V0-VSS 3.0 fOSC = 540KHz, VDD=5V Power Supply Current Rf=33K Input High Voltage 0.7VDD (Except OSC1) Input Low Voltage -0.3 (Except OSC1) Input High Voltage VDD-1 (OSC1) Input Low Voltage (OSC1) Output High Voltage IOH = -0.1mA 0.8VDD (DB0 - DB7) Output Low Voltage IOL = 0.1mA (DB0 - DB7) Output High Voltage IOH = -0.04mA 0.8VDD (Except DB0 - DB7) Output Low Voltage IOL = 0.04mA (Except DB0 - DB7) Input Leakage VIN = 0V to VDD -1 Current Pull Up MOS Current VDD = 5V 75
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2008/08/18
ST7920
AC Characteristics (TA = -30 ~ 85, VDD = 4.5V) Parallel Mode Interface Symbol fOSC fEX TR,TF TC TPW TR,TF TAS TAH TDSW TH TC TPW TR,TF TAS TAH TDDR TH TCWH TCWL TCST TSU TDH TDM Test Condition Min. Typ. Internal Clock Operation R = 33K OSC Frequency 480 540 External Clock Operation External Frequency 480 540 Duty Cycle 45 50 Rise/Fall Time Write Mode (Writing data from MPU to ST7920) Enable Cycle Time Pin E 1200 Enable Pulse Width Pin E 140 Enable Rise/Fall Time Pin E Address Setup Time Pins: RS,RW,E 10 Address Hold Time Pins: RS,RW,E 20 Data Setup Time Pins: DB0 - DB7 40 Data Hold Time Pins: DB0 - DB7 20 Read Mode (Reading Data from ST7920 to MPU) Enable Cycle Time Pin E 1200 Enable Pulse Width Pin E 140 Enable Rise/Fall Time Pin E Address Setup Time Pins: RS,RW,E 10 Address Hold Time Pins: RS,RW,E 20 Data Delay Time Pins: DB0 - DB7 Data Hold Time Pins: DB0 - DB7 20 Interface Mode with LCD Driver(ST7921) Clock Pulse with High Pins: CL1, CL2 800 Clock Pulse with Low Pins: CL1, CL2 800 Clock Setup Time Pins: CL1, CL2 500 Data Setup Time Pin: D 300 Data Hold Time Pin: D 300 M Delay Time Pin: M -1000 Characteristics Max. 600 600 55 0.2 25 25 100 1000 Unit KHz KHz % s ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
V4.0
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ST7920
AC Characteristics (TA = -30 ~ 85, VDD = 2.7V) Parallel Mode Interface Symbol fOSC fEX TR,TF TC TPW TR,TF TAS TAH TDSW TH TC TPW TR,TF TAS TAH TDDR TH TCWH TCWL TCST TSU TDH TDM Test Condition Min. Typ. Internal Clock Operation R = 18K OSC Frequency 470 530 External Clock Operation External Frequency 470 530 Duty Cycle 45 50 Rise/Fall Time Write Mode (Writing data from MPU to ST7920) Enable Cycle Time Pin E 1800 Enable Pulse Width Pin E 160 Enable Rise/Fall Time Pin E Address Setup Time Pins: RS,RW,E 10 Address Hold Time Pins: RS,RW,E 20 Data Setup Time Pins: DB0 - DB7 40 Data Hold Time Pins: DB0 - DB7 20 Read Mode (Reading Data from ST7920 to MPU) Enable Cycle Time Pin E 1800 Enable Pulse Width Pin E 320 Enable Rise/Fall Time Pin E Address Setup Time Pins: RS,RW,E 10 Address Hold Time Pins: RS,RW,E 20 Data Delay Time Pins: DB0 - DB7 Data Hold Time Pins: DB0 - DB7 20 Interface Mode with LCD Driver(ST7921) Clock Pulse with High Pins: CL1, CL2 800 Clock Pulse with Low Pins: CL1, CL2 800 Clock Setup Time Pins: CL1, CL2 500 Data Setup Time Pin: D 300 Data Hold Time Pin: D 300 M Delay Time Pin: M -1000 Characteristics Max. 590 590 55 0.2 25 25 260 1000 Unit KHz KHz % s ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
V4.0
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ST7920
8-bit interface timing diagram l MPU write data to ST7920
RS
VIH1 VIL1 TAS TAH
R/W
TPW TAH
E
TR TDSW TH
DB0-DB7
Valid data
TC
l
MPU read data from ST7920
RS
VIH1 VIL1 TAS TAH
R/W
TPW TR TAH
E
TDDR TH
DB0-DB7
Valid data
TC
V4.0
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ST7920
AC Characteristics (TA = -30 ~ 85, VDD = 4.5V) Serial Mode Interface Symbol fOSC Characteristics Test Condition Internal Clock Operation OSC Frequency R = 33K 470 External Clock Operation Pin E Pin E Pin E Pins RW Pins RW Pins RS Pins RS 470 45 400 200 200 40 40 60 60 530 590 KHz Min. Typ. Max. Unit
fEX
External Frequency Duty Cycle
530 50 -
590 55 0.2 -
KHz % s ns ns ns ns ns ns ns
TR,TF TSCYC TSHW TSLW TSDS TSDH TCSS TCSH
Rise/Fall Time Serial clock cycle SCLK high pulse width SCLK low pulse width SID data setup time SID data hold time CS setup time CS hold time
AC Characteristics (TA = -30 ~ 85, VDD = 2.7V) Serial Mode Interface Symbol Characteristics Test Condition Internal Clock Operation fOSC OSC Frequency R = 18K External Clock Operation fEX External Frequency Duty Cycle TR,TF TSCYC TSHW TSLW TSDS TSDH TCSS TCSH Rise/Fall Time Serial clock cycle SCLK high pulse width SCLK low pulse width SID data setup time SID data hold time CS setup time CS hold time Pin E Pin E Pin E Pins RW Pins RW Pins RS Pins RS 470 45 600 300 300 40 40 60 60 530 50 590 55 0.2 KHz % s ns ns ns ns ns ns ns 470 530 590 KHz Min. Typ. Max. Unit
V4.0
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ST7920
Serial interface timing diagram l MPU write data to ST7920
TCSS CS TSCYC SCLK Tf TSDS SID TSLW
TCSH
TSHW Tr TSDH
Valid data
V4.0
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ST7920
I/O pin diagram
Input PAD: E (No Pull-up)
Input PAD: RS, RW (with Pull-up)
Output PAD: CL1, CL2, M, D
Enable
DATA
I/O PAD: DB0 - DB7
V4.0
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C
B
A D
V4.0
VCC R5 4.7K R10 10K R4 4.7K R3 2.2K R2 4.7K R1 4.7K VCC JP1 HEADER 16 J1 1 2 3 CON3 R6 33K VCC 1 R7 2K C1 104 JK CON2 2 1 VCC 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 R8 R9 JP2 HEADER 2 V0 V1 V2 CLK VXA TT1 VXB VXC TT2 V3 V4 VSS VDD XRESET CL1 CL2 VDD M DOUT RS RW E VSS OSC1 OSC2 PSB D0 D1 D2 D3 D4 D5 D6 33 33 JA CON2 2 2 1 VCC 3 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 S160 S159 S158 S157 S156 S155 S154 S153 S152 S151 S150 S149 S148 S147 S146 S145 S144 S143 S142 S141 S160 S159 S158 S157 S156 S155 S154 S153 S152 S151 S150 S149 S148 S147 S146 S145 S144 S143 S142 S141 S140 S139 S138 S137 S136 S135 S134 S133 S132 S131 S130 S129 S128 S127 S126 S125 S124 S123 S122 S121 184 183 182 181 180 179 178 177 176 175 174 173 172 171 170 169 168 167 166 165 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 S140 S139 S138 S137 S136 S135 S134 S133 S132 S131 S130 S129 S128 S127 S126 S125 S124 S123 S122 S121 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 C33 C32 C31 C30 U1 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 ST7920 2 3 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 D7 XOFF VOUT CAP3M CAP1P CAP1M CAP2P CAP2M VD2 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C25 C26 C27 C28 C29 C30 C31 C32 C25 C26 C27 C28 C29 C30 C31 C32 C24 C23 C22 C21 C20 C19 C18 C17 192 191 190 189 188 187 186 185 96 95 94 93 92 91 90 89 C24 C23 C22 C21 C20 C19 C18 C17 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 C32 C31 C30 S120 S119 S118 S117 S116 S115 S114 S113 S112 S111 S110 S109 S108 S107 S106 S105 S104 S103 S102 S101 164 163 162 161 160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 S120 S119 S118 S117 S116 S115 S114 S113 S112 S111 S110 S109 S108 S107 S106 S105 S104 S103 S102 S101 S100 S99 S98 S97 S96 S95 S94 S93 S92 S91 S90 S89 S88 S87 S86 S85 S84 S83 S82 S81 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 S100 S99 S98 S97 S96 S95 S94 S93 S92 S91 S90 S89 S88 S87 S86 S85 S84 S83 S82 S81 4 4 VCC S65 S113 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 S1 V0 V2 V3 VSS VDD CL1 SHL1 SHL2 CL2 DL1 DR1 DL2 DR2 M S49 S80 S79 S78 S77 S76 S75 S74 S73 S72 S71 S70 S69 S68 S67 S66 S65 S64 S63 S62 S61 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 S80 S79 S78 S77 S76 S75 S74 S73 S72 S71 S70 S69 S68 S67 S66 S65 S64 S63 S62 S61 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 S50 S49 S48 S47 S46 S45 S44 S43 S42 S41 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 S50 S49 S48 S47 S46 S45 S44 S43 S42 S41 5 5 Size Title B Date: File: Number S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 C16 C15 C14 C13 C12 C11 C10 C9 S40 S41 S42 S43 S44 S45 S46 S47 S48 S96 S95 S94 S93 S92 S91 S90 S89 S88 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 C16 C15 C14 C13 C12 C11 C10 C9 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 C1 C2 C3 C4 C5 C6 C7 C8 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 C1 C2 C3 C4 C5 C6 C7 C8 6 1-Mar-2001 D:\Buffer-2\7920V1.DDB
ST7920
Application circuit 1:
LCD : 32-COM x 160-SEG LCD Voltage : VCC
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Sitronix ST7920 LCM
Revision S114 S115 S116 S117 S118 S119 S120 S121 S122 S123 S124 S125 S126 S127 S128 S129 S130 S131 S132 S133 S134 S135 S136 S137 S138 S139 S140 S141 S142 S143 S144 S145 S146 S147 S148 S149 S150 S151 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 S65 S66 S67 S68 S69 S70 S71 S72 S73 S74 S75 S76 S77 S78 S79 S80 S81 S82 S83 S84 S85 S86 S87 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 Sheet 1 of 1 Drawn By: Paul Yung 6 U2 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 ST7921
S66 S67 S68 S69 S70 S71 S72 S73 S74 S75 S76 S77 S78 S79 S80 S81 S82 S83 S84 S85 S86 S87 S88 S89 S90 S91 S92 S93 S94 S95 S96 S97 S98 S99 S100 S101 S102 S103
L1 WDG1603P
1.2
S104 S105 S106 S107 S108 S109 S110 S111 S112 S160 S159 S158 S157 S156 S155 S154 S153 S152
2008/08/18
B
C
A
D
C
B
A D
4.7u
LCD : 32-COM x 160-SEG LCD Voltage : VCC x 2 (Voltage doubler is used). *VLCD (V0), VOUT and VCAP3M should not over 7V.
+
V4.0
R5 4.7K R10 10K R4 4.7K R3 2.2K R2 4.7K R1 4.7K VCC JP1 HEADER 16 J1 1 2 3 CON3 R6 33K VCC 1 R7 2K C1 104 JK CON2 2 1 VCC 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 R8 R9 JP2 HEADER 2 V0 V1 V2 CLK VXA TT1 VXB VXC TT2 V3 V4 VSS VDD XRESET CL1 CL2 VDD M DOUT RS RW E VSS OSC1 OSC2 PSB D0 D1 D2 D3 D4 D5 D6 33 33 JA CON2 2 2 1 VCC + C3 4.7u C2 3 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 S160 S159 S158 S157 S156 S155 S154 S153 S152 S151 S150 S149 S148 S147 S146 S145 S144 S143 S142 S141 S160 S159 S158 S157 S156 S155 S154 S153 S152 S151 S150 S149 S148 S147 S146 S145 S144 S143 S142 S141 S140 S139 S138 S137 S136 S135 S134 S133 S132 S131 S130 S129 S128 S127 S126 S125 S124 S123 S122 S121 184 183 182 181 180 179 178 177 176 175 174 173 172 171 170 169 168 167 166 165 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 S140 S139 S138 S137 S136 S135 S134 S133 S132 S131 S130 S129 S128 S127 S126 S125 S124 S123 S122 S121 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 C33 C32 C31 C30 U1 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 ST7920 2 3 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 D7 XOFF VOUT CAP3M CAP1P CAP1M CAP2P CAP2M VD2 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C25 C26 C27 C28 C29 C30 C31 C32 C25 C26 C27 C28 C29 C30 C31 C32 C24 C23 C22 C21 C20 C19 C18 C17 192 191 190 189 188 187 186 185 96 95 94 93 92 91 90 89 C24 C23 C22 C21 C20 C19 C18 C17 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 C32 C31 C30 S120 S119 S118 S117 S116 S115 S114 S113 S112 S111 S110 S109 S108 S107 S106 S105 S104 S103 S102 S101 164 163 162 161 160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 S120 S119 S118 S117 S116 S115 S114 S113 S112 S111 S110 S109 S108 S107 S106 S105 S104 S103 S102 S101 S100 S99 S98 S97 S96 S95 S94 S93 S92 S91 S90 S89 S88 S87 S86 S85 S84 S83 S82 S81 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 S100 S99 S98 S97 S96 S95 S94 S93 S92 S91 S90 S89 S88 S87 S86 S85 S84 S83 S82 S81 4 4 VCC S65 S113 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 S1 V0 V2 V3 VSS VDD CL1 SHL1 SHL2 CL2 DL1 DR1 DL2 DR2 M S49 S80 S79 S78 S77 S76 S75 S74 S73 S72 S71 S70 S69 S68 S67 S66 S65 S64 S63 S62 S61 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 S80 S79 S78 S77 S76 S75 S74 S73 S72 S71 S70 S69 S68 S67 S66 S65 S64 S63 S62 S61 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 S50 S49 S48 S47 S46 S45 S44 S43 S42 S41 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 S50 S49 S48 S47 S46 S45 S44 S43 S42 S41 5 5 Size Title B Date: File: Number S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 C16 C15 C14 C13 C12 C11 C10 C9 S40 S41 S42 S43 S44 S45 S46 S47 S48 S96 S95 S94 S93 S92 S91 S90 S89 S88 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 C16 C15 C14 C13 C12 C11 C10 C9 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 C1 C2 C3 C4 C5 C6 C7 C8 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 C1 C2 C3 C4 C5 C6 C7 C8 6
ST7920
Application circuit 2:
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Sitronix
Revision S114 S115 S116 S117 S118 S119 S120 S121 S122 S123 S124 S125 S126 S127 S128 S129 S130 S131 S132 S133 S134 S135 S136 S137 S138 S139 S140 S141 S142 S143 S144 S145 S146 S147 S148 S149 S150 S151 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 S65 S66 S67 S68 S69 S70 S71 S72 S73 S74 S75 S76 S77 S78 S79 S80 S81 S82 S83 S84 S85 S86 S87 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57
S66 S67 S68 S69 S70 S71 S72 S73 S74 S75 S76 S77 S78 S79 S80 S81 S82 S83 S84 S85 S86 S87 S88 S89 S90 S91 S92 S93 S94 S95 S96 S97 S98 S99 S100 S101 S102 S103
ST7920 LCM (Booster)
17-Aug-2001 Sheet 1 of 1 D:\adom\Documents\sch\7920_B~13.DDB Drawn By: Paul Yang 6
U2 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39
L1 WDG1603P
ST7921
1.4
S104 S105 S106 S107 S108 S109 S110 S111 S112 S160 S159 S158 S157 S156 S155 S154 S153 S152
2008/08/18
B
C
A
D
Dot Matrix LCD Panel
Com 1-32 DL1 VDD SHL1 SHL2 VSS V0
Seg 1-64 Dout
Seg 1-96
ST7921
V2 V3
DR2 DL2 DR1 CL1 CL2 M
DL1 VDD SHL1 SHL2 VSS V0
Seg 1-96
ST7921
DR2 DL2 DR1 CL1 CL2 M
2Line 16Chinese Word (32-COM x 256-SEG)
V2
V3
ST7920
VDD VSS CL2 CL1 M V0 V1 V2 V3 V4 DB0-DB7
Application circuit 3:
Vcc(+5V/+3V) To MPU
VR
Regsister
Regsister
Regsister
Regsister
Regsister
VSS
ST7920
Note:Regsister=2.2K~10K ohm
VR=1K~30Kohm
LCD
:
V4.0
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ST7920
Application circuit for testing CGROM and HCGROM:
R1
R2
R2
R2
V4.0
49/49
2008/08/18

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