EM65568 ELAN Microelectronics Corp, EM65568 Datasheet - Page 86

• Manufacturer Part Number: EM65568
• Description: 130 Com/ 128 Seg 4096 Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

HSW
HSW=“0”: High speed writing mode off
HSW=“1”: High speed writing mode on accessing the 8-bit data RAM
C256
C256= “0”: 4096 color mode
C256= “1”: 256 color mode
8.2.17 Electronic Volume Register
(Read address: AH)
(Read address: BH)
(At the time of reset: {DV6~DV0} = 00H)
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
(N: Number of boosting steps)
The LCD drive voltage V0 is determined by VREG level and electronic volume code equation (2).
V0 = 0.5 * VREG + M * (VREG – 0.5VREG) / 127 --------------------------(2)
(M: DV6 to DV0 register values)
In order to prevent transient voltage from generating when an electronic volume code is set, the circuit design is such that the
set value is not reflected as a level immediately after only the upper bits(DV6-DV4) of the electronic code have been set. The
set value becomes valid when the lower bits (DV3-DV0) of the electronic control volume code have also been set.
* This specification is subject to be changed without notice.
D7
D7
DV6
1
1
0
0
1
1
á³ Mark shows “Don’t care”
D6
D6
0
0
DV5
0
0
1
1
D5
D5
1
1
DV4
D4
D4
0
0
1
1
0
1
-----------------------------------------------------------(1)
DV3 DV2 DV1 DV0
D3
D3
á
DV3
š
š
0
0
1
1
DV6 DV5 DV4
D2
D2
DV2
0
0
1
1
D1
D1
DV1
D0
D0
0
0
1
1
DV0
0
1
1
0
CSB
CSB
130 COM/ 128 SEG 4096 Color STN LCD Driver
0
0
86
RS
RS
1
1
Output voltage
RDB WRB RE2 RE1 RE0
RDB WRB RE2 RE1 RE0
Smaller
1
1
Larger
š
š
š
š
0
0
1
1
0
0
0
0
2005/3/8 (V1.2)
EM65568