EM73P968 datasheet(35/53 Pages) EMC

35 / 53 page

* This specification are subject to be changed without notice.

EM73P968

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

8.14.2001

Preliminary

LCD DRIVER

EM73P968 can directly drive the liquid crystal display (LCD) and has 52 segment and 4 or 5 common output

pins by mask option. There are total 52x4 or 52x5 dots can be display. The VRLC pin is the LCD driver power

input, there is the voltage of (VCC-VRLC) to LCD.

P17.0 share with com 4. When the mask option select 1/4 duty, the P17.0 is an output pin and LCD have 4

common. When the mask option select 1/5 duty, the P17.0 is a LCD pin and LCD have 5 common.

LCD driver control command register (P27) :

Port27

3210

Initial value : 0000

LDC *

LDC

LCD display control

LCD display disable

LCD display enable

* : Don't care.

Example :

LDIA

#1000B

; enable LCD, reference voltage of LCD is 1.5V.

OUTA P27

LDIA

#0000B

; disable LCD

OUTA P27

LCD RAM

20H-2CH

30H-3CH

40H-4CH

50H-5CH

60H-6CH

COM0

COM1

COM2

COM3

COM4

01234

6789

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