UPD16498 Datasheet, PDF (70/95 Pages) NEC – 1/128 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM

µPD16498
6.26 Power System Control Register 2 (R33)
This command is used to control the on-chip register for VLCD voltage regualation.
E
R,/W
RS
/RD
/WR
D7
D6
D5
D4
D3
D2
D1
D0
1
1
0
−
VRR2 VRR1 VRR0
−
PVR2 PVR1 PVR0
Setting
−
Flag
VRR2 to VRR0
PVR2 to PVR0
Function
When using normal display mode, power system control 2 (VLCD regulator resistance factor setting command) can
be used to change the resistance factor at 8 levels. The three flags in power system control 2 set the values shown
in Table 6-12 as reference values for (1 + Rb/Ra).
When using partial display mode, power system control 2 (VLCD regulator resistance factor setting command) can
be used to change the resistance factor at 8 levels. The three flags in power system control 2 set the values shown
in Table 6-12 as reference values for (1 + Rb/Ra).
Table 6-12. Reference Values for VLCD Internal Resistance Factor Regulator Register
VRR2
PVR2
0
0
0
0
1
1
1
1
Register
VRR1
PVR1
0
0
1
1
0
0
1
1
VRR0
PVR0
0
1
0
1
0
1
0
1
1+Rb/Ra
5
8
12
13
16
19
21
24
Default settings (initial values set by reset command)
D7
D6
D5
D4
D3
D2
D1
D0
−
0
0
0
−
0
0
0
70
Data Sheet S15730EJ2V0DS