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LCD_A Controller Operation
19-25LCD_A Controller
LCDAVCTL0, LCD_A Voltage Control Register 0
76543210
Unused R03EXT REXT VLCDEXT LCDCPEN VLCDREFx LCD2B
rw−0 rw−0 rw−0 rw−0 rw−0 rw−0 rw−0 rw−0
Unused
Bit 7 Unused
R03EXT
Bit 6 V5 voltage select. This bit selects the external connection for the lowest
LCD voltage. R03EXT is ignored if there is no R03 pin available.
0 V5 is AV
CC
1 V5 is sourced from the R03 pin
REXT
Bit 5 V2 − V4 voltage select. This bit selects the external connections for
voltages V2 − V4.
0 V2 − V4 are generated internally
1 V2 − V4 are sourced externally and the internal bias generator is
switched off
VLCDEXT
Bit 4 V
LCD
source select
0V
LCD
is generated internally
1V
LCD
is sourced externally
LCDCPEN
Bit 3 Charge pump enable.
0 Charge pump disabled.
1 Charge pump enabled when VLCDx > 0 or VLCDREFx > 0 and
VLCDEXT = 0
VLCDREFx
Bits
2−1
Charge pump reference select
00 Internal
01 External
10 Reserved
11 Reserved
LCD2B
Bit 0 Bias select. LCD2B is ignored when LCDMx = 00.
0 1/3 bias
1 1/2 bias