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KING BILLION ELECTRONICS CO., LTD

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HE84G752B

HE80004 Series

January 21, 2005

V0.93

This specification is subject to change without notice. Please contact sales person for the latest version before use.

Different duties require different bias settings. There is some theoretical correspondence between the

Duty and Bias Setting. However, it is better to use it as starting point and adjust it with real LCD panel

connected to it to determine the final setting. The theoretic relationship between the duty and bias setting

as following:

Duty Cycle Normal Bias Alternative Bias

32 duty

1/7

1/7.5

48 duty

1/8

1/7.5, 1/8.5

64 duty

1/9

1/8.5, 1/9.5

80 duty

1/10

1/9.5, 1/10.5

The bias setting is made by mask option MO_LBSR[2..0].

MO_LBSR[2..0]

Bias Setting

000

1/7

001

1/7.5

010

1/8

011

1/8.5

100

1/9

101

1/9.5

110

1/10

111

1/5

9. LCDC Control register

LCD Control Register LCDC controls the functions of LCD driver.

LCDC

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

Field

CLR_GP

GRAY

BLANK

LCDE

Mode

Reset

xxx

Field

Value

Function

Reset GRAY palette register pointer by write ‘0’ to CLR_GP bit.

CLR_GP

No effect on GRAY palette register pointer.

000

LCD is darkest.

LCD display contrast adjustment.

GRAY

111

LCD is lightest.

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