PIN DESCRIPTION
Figure 3. 18-Pin EPROM Mode Configuration
Table 1. 18-Pin DIP Pin Identification
EPROM Programming Mode
Pin # Symbol Function Direction
1–4 D4–D7 Data 4, 5, 6, 7 In/Output
5V
CC
Power Supply
6 N/C No Connection
7 /CE Chip Enable Input
8 /OE Output Enable Input
9 EPM EPROM Prog Mode Input
10 V
PP
Prog V oltage Input
11 Clear Clear Clock Input
12 Clock Address Input
13 /PGM Prog Mode Input
14 GND Ground
15–18 D3–D0 Data 0,1, 2, 3 In/Output
D4
D5
D6
D7
VCC
N/C
/CE
/OE
EPM
D3
D2
D1
D0
GND
/PGM
CLOCK
CLEAR
VPP
18
DIP 18 - Pin
1
910
Figure 4. 18-Pin DIP/SOIC Standard Mode
Configuration
Table 2. 18-Pin DIP/SOIC Pin Identification
Standard Mode
Pin # Symbol Function Direction
1–4 P24–P27 Port 2, Pins 4,5,6,7 In/Output
5V
cc
Power Supply
6 XTAL2 Crystal Osc. Clock Output
7 XTAL1 Crystal Osc. Clock Input
8 P31 Port 3, Pin 1, AN1 Input
9 P32 Port 3, Pin 2, AN2 Input
10 P33 Port 3, Pin 3, REF Input
11–13 P00–P02 Port 0, Pins 0,1,2 In/Output
14 GND Ground
15–18 P20–P23 Port 2, Pins 0,1,2,3 In/Output
P24
P25
P26
P27
VCC
XTAL2
XTAL1
P31
P32
P23
P22
P21
P20
GND
P02
P01
P00
P33
18
DIP 18 - Pin
1
910