Z80 Datasheet, PDF (239/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
219
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
8
from
M1
CPU
IORQ
36
RD
32
Daisy
Chain
Interrupt
Control
5V
9
GND
31
F
20
INT
5
IEI
6
7
IEO
Z80 – SIO/2
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
29
RxDB
28
RxCB
26
TxDB
27
TxCB
30
W/RDYB
CH-B
24
RTSB
23
CTSB Modem
25
22
DTRB ^Control
DCDB
C/D
B/A
Figure 106. Z80 SIO/2 Pin Assignments
UM008101-0601
Serial Input/Output