ST7920
l
Write Data to RAM
RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1
0
D7 D6 D5 D4 D3 D2 D1 D0
Code
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
1
1
D7 D6 D5 D4 D3 D2 D1 D0
Code
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.
V4.0
22/49
2008/08/18
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
