ST7920 - Topwaydisplay.com

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ST7920(AC)is also read. When BF = “1” new instruction will not be accepted. Must wait for BF = “0” for new instruction.• WRITE DATA TO RAMRSRWDB7DB6DB5DB4DB3DB2DB1DB0Code10D7D6D5D4D3D2D1D0Write data to internal RAM and alter the (AC) by 1Each RAM address (CGRAM,DDRAM,IRAM…..) must write 2 consecutive bytes for 16 bit data. After the secondbyte the address counter will add or subtract by 1 according to the entry mode set control bit.• READ RAM DATARSRWDB7DB6DB5DB4DB3DB2DB1 DB0Code11D7D6D5D4D3D2D1D0Read data from internal RAM and alter the (AC) by 1After address set to read (CGRAM,DDRAM,IRAM…..)a DUMMY READ is required.There is no need to DUMMY READ for the following bytes unless a new address set instruction is issued.V3.1 22/42 2003/04/11
ST7920Description of extended instruction set• STAND BYRSRWDB7DB6DB5DB4DB3DB2DB1DB0Code0000000001Instruction to enter stand by mode. Any other instruction follows this instruction can terminate stand by.The content of DDRAM remain the same.• VERTICAL SCROLL OR RAM ADDRESS SELECTRSRWDB7DB6DB5DB4DB3DB2DB1DB0Code000000001SRWhen SR = "1", the vertical scroll address set is enabled.When SR = "0", the IRAM address set (extended instruction) and CGRAM address set(basic instruction) is enabled.• REVERSERSRWDB7DB6DB5DB4DB3DB2DB1 DB0Code00000001R1R0Select 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. When set the first time the display is reversed and set the second time the display become normal.R1 R0 DescriptionL L First line normal or reverseL H Second line normal or reverseH L Third line normal or reverseH H Fourth line normal or reversePlease note that only 2 lines out of 4 line display data can be displayed.V3.1 23/42 2003/04/11
Page 2 and 3: ST7920ST7920 Specification Revision
Page 5 and 6: ST7920Pin coordinatesNo. Name X Y1
Page 7 and 8: ST7920Pin DescriptionName No. I/O C
Page 9 and 10: ST7920Voltage doublerVssreference v
Page 11 and 12: ST7920Display data RAM(DDRAM)There
Page 13 and 14: ST7920DDRAM data(char. code)B B BB1
Page 15 and 16: ST7920GDRAM Vertical address(Y)0123
Page 17 and 18: ST7920Instruction set 2: (RE=1: ext
Page 19 and 20: ST7920Description of basic instruct
Page 21: ST7920• FUNCTION SETRS RW DB7 DB6
Page 26 and 27: ST7920Serial interface :ST7920 is i
Page 28 and 29: ST79208 bit interface:POWER ONWait
Page 30 and 31: ST7920Built in voltage boosterVoutV
Page 32 and 33: ST7920Absolute Maximum RatingsChara
Page 34 and 35: ST7920AC Characteristics (T A = 25
Page 36 and 37: ST79208 bit interface timing diagra
Page 38 and 39: ST7920Serial interface timing diagr
Page 40 and 41: ST7920V3.1 40/42 2003/04/11Applicat
Page 42: ST7920Application circuit 3:LCD: 2L

ST7920 - Topwaydisplay.com

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