Texas Instruments MSP430x4xx - Manual (Page 375)

LCD_A Controller Operation
19-25 LCD_A Controller
LCDAVCTL0, LCD_A Voltage Control Register 0
7 6 5 4 3 2 1 0
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
0 V
LCD
is generated internally
1 V
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