Appendix C: LCD Interface
R
Table C-7:
Display Instructions (Continued)
Instruction
Reverse display ON/OFF
RS
0
RW
0
DB7
1
DB6
0
DB5
1
DB4
0
DB3
0
DB2
1
DB1
1
DB0
REV
REV
0
1
RAM bit data = '1'
Pixel ON
Pixel OFF
RAM bit data = '0'
Pixel OFF
Pixel ON
Entire display ON/OFF
0
0
1
0
1
0
0
1
0
EON
This instruction forces the display to be turned on regardless of the contents of the display data RAM. The contents of the display data RAM
are saved. This instruction has priority over reverse display.
LCD bias select
0
0
1
0
1
0
0
0
1
BIAS
This instruction selects the LCD bias.
Duty
ratio
1/65
Bias = 0
1/7
Bias = 1
1/9
Set modify-read
0
0
1
1
1
0
0
0
0
0
This instruction stops the automatic incrementing of the column address by a read operation. The automatic increment is still done with a
write operation.
Reset modify-read
0
0
1
1
1
0
1
1
1
0
This instruction resets the changed modify-read to the normal.
Reset
0
0
1
1
1
0
0
0
1
0
This instruction resets the LCD controller registers to the default values. The instruction CANNOT initialize the LCD power supply initialized
with RESETB.
SHL select
0
0
1
1
0
0
SHL
x
x
x
This instruction sets the COM output scanning direction.
SHL = 0, COM1 ----> COM64
SHL = 1, COM64 ----> COM1
(default)
Power Control
0
0
0
0
1
0
1
VC
VR
VF
This instruction selects one of the eight power circuit functions. In the case of the DisplayTech 64128EFCBC display, these must be kept at
“000.”
Regulator resistor select
0
0
0
0
1
0
0
R2
R1
R0
This instruction selects the resistor ratio Rb/Ra.
Set static indicator mode
Set static indicator register
0
0
0
0
1
x
0
x
1
x
0
x
1
x
1
x
0
S1
SM
S0
This is a two-byte instruction. The first instruction enables the second instruction. The second instruction update the contents of the static
indicator register.
78
ML550 Networking Interfaces Platform
UG202 (v1.4) April 18, 2008
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