EM73P362 datasheet(19/44 Pages) EMC

19 / 44 page

This specification are subject to be changed without notice.

11.1.2001

EM73P362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

CONTR

CONTROL OF LCD DRIVER

OL OF LCD DRIVER

The LCD driver control command register is P27. When LDC is 00, the LCD is disabled and changes the

duty only. When LDC is 01, the LCD is blanking, the COM pins are inactive and the SEG pins continuously

output the display data. When LDC is 11, the LCD driver enables, the power switch is turned on and it

cannot be turned off forever except the CPU is reseted or in the STOP operation mode. Users must enable

the LCD driver by self when the CPU is woke up.

P27

Initial value : 0000

LDC

DUTY

LDC LCD display control

DUTY

Driving method select

0 0

LCD display disable

0 0

Reserved

0 1

Blanking

0 1

1/3 duty ( 1/2 bias )

1 0

Reserved

1 0

1/2 duty ( 1/2 bias )

1 1

LCD display enable

1 1

Static

LCD driving methods

There are four kinds of driving methods can be selected by DUTY ( P27.0 ~ P27.1 ). The driving wave

forms of LCD driver are as below :

LCD DRIVER

EM73P362 can directly drive the liquid crystal display (LCD) and has 27 segment, 3 common output pins.

There are total 27 x 3 dots can be display. The VDD, VEE, VA, VB and VSS pins are the bias voltage

inputs of the LCD driver. The method of LCD programming is RAM mapping.

1/3 duty (1/2 bias)

SEG0

SEG0 - COM0

SEG0 - COM1

OFF

Frame

COM1

COM2

COM0

Frame

1/2 duty (1/2 bias)

SEG0

SEG1

SEG2

Static

ON OFF

Frame

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