Z80 Datasheet, PDF (235/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
215
CPU
Data
BUS
D0
40
D1
1
D2
39
D3
2
D4
38
D5
3
D6
37
D7
4
CE
35
SIO
RESET
21
Control
from
CPU
M1
8
IORQ
36
RD
32
Daisy
Chain
Interrupt
Control
5V
9
GND
31
Φ
20
INT
5
IEI
6
7
IEO
Z80 – SIO/0
33
34
12
RxDA
13
RxCA
15
TxDA
14
TxCA
11
SYNCA
10
W/RDYA
CH-A
17
RTSA
18
CTSA
16
19
DTRA
Modem
Control
DCDA
28
RxDB
27
RxTxCB
26
TxDB
29
SYNCB
30
W/RDYB
CH-B
24
RTSB
23
CTSB Modem
25
DTRB ^Control
22
DCDB
C/D
B/A
Figure 102. Z80 SIO/0 Pin Assignments
UM008101-0601
Serial Input/Output