NOTE: Settings for LCDREXT, R03EXT, LCDEXTBIAS, VLCDEXT, VLCDREFx, and LCD2B should be changed only while LCDON = 0.
Figure 36-16 LCDCVCTL Register
15
14
13
12
11
10
9
8
Reserved
VLCDx
Reserved
r0
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
r0
7
6
5
4
3
2
1
0
LCDREXT
R03EXT
LCDEXTBIAS
VLCDEXT
LCDCPEN
VLCDREFx
LCD2B
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
Table 36-12 LCDCVCTL Register Description
Bit
Field
Type
Reset
Description
15-13
Reserved
R
0h
Reserved
12-9
VLCDx
RW
0h
Charge pump voltage select. LCDCPEN must be 1 for the charge pump to be enabled. VCC is used for VLCD when VLCDx = 0000 and VLCDREFx = 00 and VLCDEXT = 0.
0000b = Charge pump disabled
0001b =
If VLCDREFx = 00 or 10: VLCD = 2.60 V;
If VLCDREFx = 01 or 11: VLCD = 2.17 × VREF
0010b to 1110b =
If VLCDREFx = 00 or 10: VLCD = 2.60 V + (VLCDx – 1) × 0.06 V;
If VLCDREFx = 01 or 11: VLCD = 2.17 × VREF + (VLCDx – 1) × 0.05 × VREF
1111b =
If VLCDREFx = 00 or 10: VLCD = 2.60 V + (15 – 1) × 0.06 V = 3.44 V;
If VLCDREFx = 01 or 11: VLCD = 2.17 × VREF + (15 – 1) × 0.05 × VREF = 2.87 × VREF
8
Reserved
R
0h
Reserved
7
LCDREXT
RW
0h
V2 to V4 voltage on external Rx3 pins. This bit selects the external connections for voltages V2 to V4 with internal bias generation (LCDEXTBIAS = 0). The bit is don't care if external biasing is selected (LCDEXTBIAS = 1).
NOTE: Should be changed only while LCDON = 0.
0b = Internally generated V2 to V4 are not switched to pins (LCDEXTBIAS = 0)
1b = Internally generated V2 to V4 are switched to pins (LCDEXTBIAS = 0)
6
R03EXT
RW
0h
V5 voltage select. This bit selects the external connection for the lowest LCD voltage. R03EXT is ignored if there is no R03 pin available.
NOTE: Should be changed only while LCDON = 0.
0b = V5 is VSS
1b = V5 is sourced from the R03 pin
5
LCDEXTBIAS
RW
0h
V2 to V4 voltage select. This bit selects the generation for voltages V2 to V4.
NOTE: Should be changed only while LCDON = 0.
0b = V2 to V4 are generated internally
1b = V2 to V4 are sourced externally and the internal bias generator is switched off
4
VLCDEXT
RW
0h
VLCD source select
NOTE: Should be changed only while LCDON = 0.
0b = VLCD is generated internally
1b = VLCD is sourced externally
3
LCDCPEN
RW
0h
Charge pump enable
0b = Charge pump disabled
1b = Charge pump enabled when VLCD is generated internally (VLCDEXT = 0) and VLCDx > 0 or VLCDREFx > 0
2-1
VLCDREFx
RW
0h
Charge pump reference select. If LCDEXTBIAS = 1 or LCDREXT = 1, settings 01, 10, and 11 are not supported; the internal reference voltage is used instead.
NOTE: Should be changed only while LCDON = 0.
00b = Internal reference voltage
01b = External reference voltage
10b = Internal reference voltage switched to external pin LCDREF/R13
11b = Reserved (defaults to external reference voltage)
0
LCD2B
RW
0h
Bias select. LCD2B is ignored in static mode or mux modes ≥5.