Datasheet

Table Of Contents
Section 21 LCD Controller/Driver
Rev. 2.00 Jul. 04, 2007 Page 464 of 692
REJ09B0309-0200
Bit Bit Name
Initial
Value
R/W Description
2
1
0
CTRM2
CTRM1
CTRM0
0
0
0
R/W
R/W
R/W
Variable Voltage Adjustment of 3-V Constant-Voltage
Power Supply*
1
*
2
The LCD drive power supply adjusted by the TRM bits
can further be adjusted.
If an LCD panel does not function normally due to a
temperature in which LCD is used, set these bits to
adjust it.
000: ±0 V
001: 0.09 V
010: 0.18 V
011: 0.27 V
100: -0.36 V
101: -0.27 V
110: -0.18 V
111: -0.09 V
Note: 1. These are approximate values and are not guaranteed. That is, the values are for
reference only.
2. Setting of LTRMR
The standard of the voltage after it trims becomes the following.
V1 Initial state output voltage : A
LTRMR Register TRM3 to TRM0 : B
LTRMR Register CTRM3 to CTRM0 : C
V1 Output voltage = A + B + C
V2 Output voltage = (A + B + C)*2/3
V3 Output voltage = (A + B + C)/3
Please set A, B, and C so that the V1 voltage may become 3-V.