EM65568 ELAN Microelectronics Corp, EM65568 Datasheet - Page 88

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

8.2.19 Extended power control
(At the time of reset: {HPM, DIS} = 0H, {BF1,BF0}=0H;read address: EH)
The DIS register can control capacitors discharged that connected between the power supply V0-V4 for LCD drive voltage and
VSS.
When using this register, refer to 6-30 (Discharge circuit).
The HPM register is the power control for the power supply circuit for liquid crystal drive.
HPM= “H”: High power mode
HPM= “L”: Normal mode
BF1~BF0: The operating frequency in the booster is selected. When the boosting frequency is high, the driving ability of
booster become high, but the current consumption is increased. Adjust the boosting frequency considering the external
capacitors and the current consumption.
8.2.20 Internal Register Read Address
(At the time of reset: {RA3,RA2,RA1,RA0} = BH)
The RA register set to specify the address for register read operation. The EM65568 has many registers and has register bank.
Therefore, it is need 4-steps to read to read the specific register in maximum case.
* This specification is subject to be changed without notice.
D7
BF1
D7
(1)
(2)
(3)
(4)
1
1
0
0
1
1
DIS = “0”: Discharge OFF
DIS = “1”: Discharge start
D6
D6
1
1
BF0
0
1
0
1
D5
D5
1
0
Write 04H to RE register for access to RA register.
Writes specific register address to RA register.
Write specific register bank to RE register.
Read specific contents.
D4
D4
0
1
RA3 RA2 RA1 RA0
BF1 BF0 HPM DIS
D3
D3
Operating clock frequency in the booster
D2
D2
D1
D1
1.5K Hz * 8
1.5K Hz * 4
1.5K Hz * 2
1.5 K Hz
D0
D0
CSB
CSB
130 COM/ 128 SEG 4096 Color STN LCD Driver
0
0
88
RS
RS
1
1
RDB WRB RE2 RE1 RE0
RDB WRB RE2 RE1 RE0
1
1
0
0
1
1
0
0
0
0
2005/3/8 (V1.2)
EM65568