4
PIN DESCRIPTION (Continued)
Standard Mode
N/C
P30
P37
XTAL1
XTAL2
VCC
P36
P31
P27
P26
P25
P03
P04
P05
P06
P07
P10
P11
P12
P13
P14
N/C
N/C
P24
P23
P22
P21
P20
P33
P34
P17
P16
P15
/RESET
R//W
/DS
/AS
P35
GND
P32
P00
P01
P02
R//RL
7
8
9
10
11
12
13
14
15
16
17
38
37
36
35
34
33
32
31
30
29
39
Z86E21
PLCC
6543214443424140
18 19 20 21 22 23 24 25 26 27 28
Pin # Symbol Function Direction
14-16 P00-P02 Port 0 pin 0,1,2 In/Output
17 R//RL ROM/ROMless control Input
18-22 P03-P07 Port 0 pin 3,4,5,6,7 In/Output
23-27 P10-P14 Port 1 pin 0,1,2,3,4 In/Output
28 N/C Not Connected Input
29-31 P15-P17 Port 1 pin 5,6,7 In/Output
32 P34 Port 3 pin 4 Output
33 P33 Port 3 pin 3 Input
34-38 P20-P24 Port 2 pin 0,1,2,3,4 In/Output
39 N/C Not Connected Input
40-42 P25-P27 Port 2 pin 5,6,7 In/Output
43 P31 Port 3 pin 1 Input
44 P36 Port 3 pin 6 Output
Pin # Symbol Function Direction
1V
CC
Power Supply Input
2 XTAL2 Crystal, Oscillator Clock Output
3 XTAL1 Crystal, Oscillator Clock Input
4 P37 Port 3 pin 7 Output
5 P30 Port 3 pin 0 Input
6 N/C Not Connected Input
7 /RESET Reset Input
8 R//W Read/Write Output
9 /DS Data Strobe Output
10 /AS Address Strobe Output
11 P35 Port 3 pin 5 Output
12 GND Ground, GND Input
13 P32 Port 3 pin 2 Input
44-Lead PLCC Pin Assignments
44-Lead PLCC Pin Identification
