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ST7565S
Ver 0.3c
45/72
2002/07/22
LCD Bias Set
This command selects the voltage bias ratio required for the liquid crystal display.
Select Status
E
R/W
A0
/RD
/WR
D7
D6
D5
D4
D3
D2
D1
D0 1/65duty
1/49duty 1/33duty 1/55duty 1/53duty
1/9 bias
1/8 bias
1/6 bias
1/8 bias
1/8 bias
0
1
0
1
0
1
0
0
0
1
0
1
1/7 bias
1/6 bias
1/5 bias
1/6 bias
1/6 bias
Read/Modify/Write
This command is used paired with the “END” command. Once this command has been input, the display data read command
does not change the column address, but only the display data write command increments (+1) the column address. This mode
is maintained until the END command is input. When the END command is input, the column address returns to the address it
was at when the read/modify/write command was entered. This function makes it possible to reduce the load on the MPU when
there are repeating data changes in a specified display region, such as when there is a blanking cursor.
E
R/W
A0
/RD
/WR
D7 D6 D5 D4 D3 D2 D1 D0
0
1
0
1
1
1
0
0
0
0
0
* Even in read/modify/write mode, other commands aside from display data read/write commands can also be used.
END
Page address set
Column address set
Dummy read
Data read
Data write
Changes
Finished ?
Read-modify-write cycle
NO
YES
Figure 24 Command Sequence For read modify write
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