Z86C21 Datasheet, PDF (3/35 Pages) Zilog, Inc. – 8K ROM Z8 CMOS MICROCONTROLLER

PIN DESCRIPTION
VCC 1
40
P36
XTAL2 2
39
P31
XTAL1 3
38
P27
P37 4
37
P26
P30 5
36
P25
/RESET 6
35
P24
R//W 7
34
P23
/DS 8
33
P22
/AS 9
32
P21
P35
10
Z86C21
DIP
31
P20
GND 11
30
P33
P32 12
29
P34
P00 13
28
P17
P01 14
27
P16
P02 15
26
P15
P03 16
25
P14
P04 17
24
P13
P05 18
23
P12
P06 19
22
P11
P07 20
21
P10
Figure 2. 40-Pin DIP Pin Assignments
Z86C21 MCU
WITH 8K ROM
Table 1. 40-Pin DIP Pin Identification
Pin # Symbol Function
Direction Pin # Symbol Function
Direction
1
V
Power Supply
Input
11 GND
Ground
CC
2
XTAL2 Crystal, Oscillator Clock Output
12 P32
Port 3, Pin 2
Input
Input
3
XTAL1 Crystal, Oscillator Clock Input
13-20 P00-P07 Port 0, Pins 0,1,2,3,4,5,6,7 In/Output
4
P37
Port 3, Pin 7
Output
21-28 P10-P17 Port 1, Pins 0,1,2,3,4,5,6,7 In/Output
5
P30
Port 3, Pin 0
Input
29 P34
Port 3, Pin 4
Output
6
/RESET Reset
7
R//W
Read/Write
8
/DS
Data Strobe
9
/AS
Address Strobe
10 P35
Port 3, Pin 5
Input
Output
Output
Output
Output
30
31-38
39
40
P33
P20-P27
P31
P36
Port 3, Pin 3
Input
Port 2, Pins 0,1,2,3,4,5,6,7 In/Output
Port 3, Pin 1
Input
Port 3, Pin 6
Output
3