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SH69P55A/K55A
33
LCD Power
LCD
common
driver
&
scan
input
LCD
segment
driver
&
scan
output
com1
seg1
seg20
LCD
Power
Supply
Control
Circuit
V
LCD
R1
R2
R3
LCD ON
com8
-
-
V1
V2
V3
SEG Configuration Register: $2E
Address
Bit 3
Bit 2
Bit 1
Bit 0
R/W
Remarks
$2E RLCD - - -
R/W
Bit3: Set LCD bias resistor register
0
X
X
X
R/W
R1 = R2 = R3 = 90k
1
X
X
X
R/W
R1 = R2 = R3 = 10k
X
X
X
X
R/W
R1 = R2 = R3 = 3k, if KEYEN = 1
When a large LCD panel is used, user can set the value of $2E to increase the bias current for better LCD performance. But
it will cost more power, when the smaller divider resistances are used.
When the CPU is in STOP mode, the COM1-8 and SEG1-20 are pulled low.