EM73866 Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM73866

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73866

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

The storing region of data RAM for LCD display data.

RAM

COM3

address

bit3

SEG0

20H

SEG1

21H

SEG2

22H

:

:

SEG32

3FH

COM2

bit2

COM1

bit1

COM0

bit0

The relation between LCD display data and driving method

Driving method

bit3

bit2

1/4 duty

COM3 COM2

1/3 duty

-

COM2

1/2 duty

-

-

Static

-

-

PROGRAM EXAMPLE:

LDIA #0000B

OUTA P27 ; Set LCD duty

LDIA #1100B

OUTA P27 ; Enable LCD

LDIA #1010B

STA 24H

LCD driving methods

bit1

COM1

COM1

COM1

-

bit0

COM0

COM0

COM0

COM0

There are four kinds of driving methods can be selected by DUTY (P27.0~P27.1). Ther are two waveform

types, but for the reason of the number of voltage transition point in type A is greater than type B, so type B

gets a better display performance. The driving waveforms type A and B of LCD driver are as below :

* This specification are subject to be changed without notice.

12.29.1999 23

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