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UPD16488AP Datasheet(PDF) 33 Page - NEC

Part # UPD16488AP
Description  1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
PDF  91 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD16488AP Datasheet(HTML) 33 Page - NEC

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Data Sheet S15745EJ2V0DS
33
µµµµPD16488A
Table 5-12.
α
αα
α Values Based on Settings in Electronic Volume Register
Register
EV7
EV6
EV5
EV4
EV3
EV2
EV1
EV0
PEV7
PEV6
PEV5
PEV4
PEV3
PEV2
PEV1
PEV0
α
00000000
384
00000001
254
00000010
253
00000011
252
::
11111101
2
11111110
1
11111111
0
Rb/Ra is an on-chip resistance factor used for the VLCD voltage regulator. This factor can be controlled at eight levels
based on settings in power control register 2 (R33) (VRR2, VRR1, VRR0: normal display mode and PVR2, PVR1, PVR0:
partial display mode). Reference voltage values (1 + Rb/Ra) are determined based on 4-bit data set to VLCD's on-chip
resistance factor register, as shown in Table 5-13.
Table 5-13. Determination of Reference Voltage Values Based on Settings of
On-Chip Resistor for VLCD Voltage Regulation
Register
VRR2
VRR1
VRR0
PVR2
PVR1
PVR0
1+Rb/Ra
000
5
001
8
010
12
011
13
100
16
101
19
110
21
111
24



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