Z80 Datasheet, PDF (237/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
217
CPU
Data
BUS
D0
40
D1
1
D2
39
D3
2
D4
38
D5
3
37
D6
D7
4
CE
35
SIO
Control
from
CPU
RESET
M1
IORQ
21
8
36
RD
32
Daisy
Chain
Interrupt
Control
5V
9
31
GND
F
20
INT
5
IEI
6
7
IEO
Z80 – SIO/1
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
25
TxDB
26
TxCB
29
SYNCB
30
W/RDYB
CH-B
24
RTSB
23
Modem
CTSB _Control
22
DCDB
C/D
B/A
Figure 104. Z80 SIO/1 Pin Assignments
UM008101-0601
Serial Input/Output