EM65567AF datasheet(72/93 Pages) EMC

72 / 93 page

Preliminary

EM65567

66 COM/ 96 SEG 256 Color STN LCD Driver

* This specification is subject to be changed without notice.

2003/1/9 (V0.1)

(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

CSB

RDB WRB RE2

RE1

RE0

110

RA3 RA2 RA1 RA0

0110100

(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.

(1)

Write 04H to RE register for access to RA register.

(2)

Writes specific register address to RA register.

(3)

Write specific register bank to RE register.

(4)

Read specific contents.

8.2.23 Resistance Ratio of CR Oscillator

CSB

RDB WRB RE2

RE1

RE0

110

※

RF2

RF1

RF0

0110100

(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.

RF2 RF1 RF0

Operation

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

EM65567AF Datasheet(PDF) 72 Page - ELAN Microelectronics Corp

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