em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 71

• Manufacturer Part Number: em65567
• Description: Com/ Color Driver
• Manufacturer: ELAN Microelectronics Corp

8.2.20 RAM Data Length Set
(At the time of reset: {WLS} = 0H, read address: 9H)
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The WLS register select data bus size for access from MPU
WLS = “0”: The data bus size is 8-bits width
WLS = “1”: The data bus size is 16-bits width
When MPU access to control register using 16-bits bus size, high byte data is ignored.
8.2.21 Electronic Volume Register Set
(Read address: AH)
(Read address: BH)
(At the time of reset: {DV6~DV0} = 00H)
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The DV register can control V0 voltage.
The DV register has 7-bits, so can select 128 level voltage.
The output voltage at VREG is specified by equation (1).
VREG = VREF * N * 0.9-----------------------------------------------------------(1)
(N: Number of boosting steps)
The LCD driver voltage V0 is determined by VREG level and electronic volume code equation (2).
V0 = 0.5 * VREG + M * (VREG – 0.5VREG) / 127 --------------------------(2)
* This specification is subject to be changed without notice.
D7
D7
D7
DV6
1
1
1
0
0
1
1
PWM = “0”: Variable display mode using 8 gradations selected from 32 gradations
PWM = “1”: 8-gradation fixed display mode
D6
D6
D6
0
0
0
DV5
0
0
1
1
D5
D5
D5
0
1
1
DV4
0
0
1
1
D4
D4
D4
1
0
1
DV3
DV3 DV2 DV1 DV0
：
：
D3
D3
D3
0
0
1
1
※
※
DV6 DV5 DV4
D2
D2
D2
DV2
※
0
0
1
1
D1
D1
D1
※
DV1
0
0
1
1
WLS
D0
D0
D0
DV0
0
1
0
1
CSB
CSB
CSB
0
0
0
71
66 COM/ 96 SEG 256 Color STN LCD Driver
RS
RS
RS
1
1
1
Output voltage
Smaller
Larger
RDB WRB RE2
RDB WRB RE2
RDB WRB RE2
：
：
：
：
1
1
1
0
0
0
1
1
1
RE1
RE1
RE1
0
0
0
RE0
RE0
RE0
0
0
0
2003/1/9 (V0.1)
EM65567