Daewoo 2898ST Service Manual page 40

(4) Pin Description
PIN SYMBOL
1,2,3,4 K0,K1,K2,K3
5,6,7,8,9,10 D0,D1,D2,D3,D4,D5
11 REMOUT
12 OSC 2
13 OSC 1
14 Vdd
15 RESET
16 GND
17,18,19,20 R0,R1,R2,R3
DESCRIPTION
4 bit input port with built in pull up resistor
10 bit output port which can be set or reset pin
by pin independently.
The output structure is N-channel open drain.
remote control signal output port which has
high current driving capability
oscillator output
oscillator input
2-4V power supply
reset signal input which is a low active
ground
4 bit programmable I/O port
40