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Syntek Semiconductor Co., Ltd
LCD Controller
3 / 3
ISSUE DATE : 3 March, 2000
STK55C641
4. PIN DESCRIPTION :
(Total 100 pads)
Pin name
I/O
Function description
COM1-COM16
O
LCD common output pins
SEG1...SEG40
O
LCD segment output pins
VLCD
I
LCD voltage input
VR
I
LCD contrast control
CLK256
O
256 Hz clock output
P10-P17
I/O
8-bit I/O pins for port 1
P20-P27
I/O
8-bit I/O pins for port 2
P30-P37
I/O
8-bit I/O pins for port 3
P40-P45
I/O
6-bit I/O pins for port 4
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
SOUND
O
Audio output
/RES
I
System reset
/TEST
I
Test pin. Keep floating or connect to Vdd
VDD
Power input
VSS1, VSS2
Signal ground
5. ADDRESS ARRANGEMENT
Please note that A14-A15 are not cared in hardware. So, following memory areas are mapping
in the same location.
0000-3FFF, 4000-7FFF, 8000-BFFF, C000-FFFF.
1) RAM
0000-007F for LCD output data storage.
Memory address
Pin for 1/16 duty
Pin for 1/8 duty
0000-0004
COM1
COM1
0008-000C
COM2
COM2
0010-0014
COM3
COM3
0018-001C
COM4
COM4
0020-0024
COM5
COM5
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