Z86C21 Datasheet, PDF (4/35 Pages) Zilog, Inc. – 8K ROM Z8 CMOS MICROCONTROLLER

PIN DESCRIPTION (Continued)
Z86C21 MCU
WITH 8K ROM
6 5 4 3 2 1 44 43 42 41 40
/RESET ⁷
R//W ⁸
/DS 9
/AS 10
P35 11
GND 12
P32 13
P00 14
P01 15
P02 16
R//RL 17
Z86C21
PLCC
39 N/C
38 P24
37 P23
36 P22
35 P21
34 P20
33 P33
32 P34
31 P17
30 P16
29 P15
18 19 20 21 22 23 24 25 26 27 28
Figure 3. 44-Pin PLCC Pin Assignments
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
Symbol
V
CC
XTAL2
XTAL1
P37
P30
N/C
/RESET
R//W
/DS
/AS
P35
GND
P32
Table 2. 44-Pin PLCC Pin Identification
Function
Direction Pin # Symbol Function
Direction
Power Supply
Crystal, Oscillator Clock
Crystal, Oscillator Clock
Port 3, Pin 7
Input
Output
Input
Output
14-16
17
18-22
23-27
P00-P02
R//RL
P03-P07
P10-P14
Port 0, Pins 0,1,2
ROM/ROMless control
Port 0, Pins 3,4,5,6,7
Port 1, Pins 0,1,2,3,4
In/Output
Input
In/Output
In/Output
Port 3, Pin 0
Not Connected
Reset
Read/Write
Data Strobe
Address Strobe
Port 3, Pin 5
Ground
Port 3, Pin 2
Input
Input
Input
Output
Output
Output
Output
Input
Input
28
29-31
32
33
N/C
P15-P17
P34
P33
34-38
39
40-42
43
44
P20-P24
N/C
P25-P27
P31
P36
Not Connected
Port 1, Pins 5,6,7
Port 3, Pin 4
Port 3, Pin 3
Port 2, Pins 0,1,2,3,4
Not Connected
Port 2, Pins 5,6,7
Port 3, Pin 1
Port 3, Pin 6
Input
In/Output
Output
Input
In/Output
Input
In/Output
Input
Output
\4