RW1068 ETC-unknow, RW1068 Datasheet - Page 30

• Manufacturer Part Number: RW1068
• Description: 26com/84seg Driver & Controller For Dot Matrix Lcd
• Manufacturer: ETC-unknow

This instruction shows whether RW1068 is in internal operation or not. If the resultant BF is High, it
means the internal operation is in progress and you have to wait until BF to be Low, and then the next
instruction can be performed. In this instruction you can read also the value of address counter.
Write binary 8-bit data to DDRAM/CGRAM/SEGRAM.
The selection of RAM from DDRAM, CGRAM, or SEGRAM, is set by the previous address set
instruction:
DDRAM address set, CGRAM address set, SEGRAM address set. RAM set instruction can also
determines the AC direction to RAM. After write operation, the address is automatically
increased/decreased by 1, according to the entry mode.
Read binary 8-bit data from DDRAM/CGRAM/SEGRAM. The selection of RAM is set by the previous
address set instruction. If address set instruction of RAM is not performed before this instruction, the
data that read first is invalid, because the direction of AC is not determined. If you read RAM data
several times without RAM address set instruction before read operation, you can get correct RAM
data from the second, but the first data would be incorrect, because there is no time margin to transfer
RAM data. In case of DDRAM read operation, cursor shift instruction plays the same role as DDRAM
address set instruction : it also transfer RAM data to output data register. After read operation address
counter is automatically increased/decreased by 1 according to the entry mode.
After CGRAM/SEGRAM read operation, display shift may not be executed correctly.
- In case of RAM write operation, after this AC is increased/decreased by 1 like read operation. In this
time, AC indicates the next address position, but you can read only the previous data by read
instruction.
RS
RS
RS
0
1
1
Read Busy Flag & Address
Write Data to RAM
Read Data from RAM
R/W
R/W
R/W
1
0
1
DB7
DB7
DB7
BF
D7
D7
DB6
AC6
DB6
DB6
26COM/84SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
D6
D6
RockWorks Technology Corp.
DB5
DB5
DB5
AC5
D5
D5
30
AC4
DB4
DB4
DB4
D4
D4
AC3
DB3
DB3
DB3
D3
D3
DB2
DB2
DB2
AC2
D2
D2
DB1
DB1
DB1
AC1
RW1068
D1
D1
DB0
DB0
DB0
AC0
D0
D0