em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 72

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

(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.
8.2.22 Internal Register Read Address
(At the time of reset: {RA3, RA2, RA1, RA0} = CH)
The RA register set to specify the address for register read operation. The EM65567 has many registers and has register bank.
Therefore, it is need 4-steps to read to read the specific register in maximum case.
8.2.23 Resistance Ratio of CR Oscillator
(At the time of reset: {RF2, RF1, RF0} = 0H, read address: DH)
※ Mark shows “Don’t care”
The RF registers can control resistance ratio of CR oscillator. Therefore frame frequency can change RF registers setting.
When change RF registers value, should be need to check LCD display quality.
* This specification is subject to be changed without notice.
RF2 RF1 RF0
D7
D7
(1)
(2)
(3)
(4)
0
0
0
0
1
1
1
1
1
1
D6
D6
0
0
1
1
0
0
1
1
1
1
0
1
0
1
0
1
0
1
D5
D5
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.
0
0
Initial Resistance Ratio
0.8 times of initial Resistance Ratio
0.9 times of initial Resistance Ratio
1.1 times of initial Resistance Ratio
1.2 times of initial Resistance Ratio
Prohibit Code
Prohibit Code
Prohibit Code
D4
D4
1
1
RA3 RA2
D3
D3
※
RF2
D2
D2
RA1 RA0
RF1
D1
D1
Operation
RF0
D0
D0
CSB
CSB
0
0
72
66 COM/ 96 SEG 256 Color STN LCD Driver
RS
RS
1
1
RDB WRB RE2
RDB WRB RE2
1
1
0
0
1
1
RE1
RE1
0
0
RE0
RE0
0
0
2003/1/9 (V0.1)
EM65567