Z86C21 Datasheet, PDF (5/35 Pages) Zilog, Inc. – 8K ROM Z8 CMOS MICROCONTROLLER

Z86C21 MCU
WITH 8K ROM
/RESET
R//W
/DS
/AS
P35
GND
P32
P00
P01
P02
R//RL
33 32 31 30 29 28 27 26 25 24 23
34
22
35
21
36
20
37
19
38
18
39
Z86C21
QFP
17
40
16
41
15
42
14
43
13
44
12
1 2 3 4 5 6 7 8 9 10 11
GND
P24
P23
P22
P21
P20
P33
P34
P17
P16
P15
Figure 4. 44-Pin QFP Pin Assignments
Pin # Symbol
1-5
6
7-14
15
P03-P07
GND
P10-P17
P34
16
17-21
22
23-25
P33
P20-P24
GND
P25-P27
26
P31
27
P36
28
GND
29
V
CC
30
XTAL2
Table 3. 44-Pin QFP Pin Identification
Function
Direction Pin # Symbol Function
Direction
Port 0, Pins 3,4,5,6,7 In/Output 31
Ground
Input
32
Port 1, Pins 0 through 7 In/Output 33
Port 3, Pin 4
Output
34
XTAL1
P37
P30
/RESET
Crystal, Oscillator Clock
Port 3, Pin 7
Port 3, Pin 0
Reset
Input
Output
Input
Input
Port 3, Pin 3
Port 2, Pins 0,1,2,3,4
Ground
Port 2, Pins 5,6,7
Input
35
In/Output 36
Input
37
In/Output 38
R//W
/DS
/AS
P35
Read/Write
Data Strobe
Address Strobe
Port 3, Pin 5
Output
Output
Output
Output
Port 3, Pin 1
Port 3, Pin 6
Ground
Power Supply
Crystal, Oscillator Clock
Input
Output
Input
Input
Output
39
40
41-43
44
GND
P32
P00-P02
R//RL
Ground
Port 3, Pin 2
Port 0, Pins 0,1,2
ROM/ROMless control
Input
Input
In/Output
Input
5