LCD Controller

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Issue date: 13 August, 1999

Syntek Semiconductor Co., Ltd.

STK55C324

4. PIN DESCRIPTION :

(Total 66 pads)

Pin name

I/O

Function description

COM0-COM7

O

LCD common output pins

SEG0-SEG39

O

LCD segment output pins

P10-P17

I/O

8-bit I/O pins for port 1

OSC1

I

Main system oscillator input pin for chip

OSC2

O

Main system oscillator output pin for resistor

XOSC1

I

32.768K Hz crystal oscillator input

XOSC2

O

32.768K Hz crystal oscillator output

SOUND1

O

Sound channel 1 output with volume control. This pin is

CMOS output when sound channel is disabled.

SOUND2

O

Sound channel 2 output with volume control. This pin is

CMOS output when sound channel is disabled.

/RES

I

System reset pin with 150K pull-up resistor.

CONTRAST

I

Bias voltage input pin. Add a resistor to Vdd can

change the LCD contrast.

VDD

Power input

VSS

Signal ground

5. ADDRESS ARRANGEMENT

1) RAM

0000-003C for LCD output data storage. The memory address which are not specified in the table are

not implemented

Memory address

Pin for 1/8 duty

0000-0004

COM0

0008-000C

COM1

0010-0014

COM2

0018-001C

COM3

0020-0024

COM4

0028-002C

COM5

0030-0034

COM6

0038-003C

COM7

The LSB of low byte – SEG0.

The MSB of high byte – SEG39.