Z80 Datasheet, PDF (238/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

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218
D1
D3
D5
D7
INT
IEI
IEO
M1
VDD
W/RDYA
SYNCA
RxDA
RxCA
TxCA
TxDA
DTRA
RTSA
CTSA
DCDA
F
1
40
2
39
3
38
4
37
5
36
6
35
7
34
8
33
9
32
10
31
11 _{Z80 SIO/2} 30
12
29
13
28
14
27
15
26
16
25
17
24
18
23
19
22
20
21
Figure 105. Z80 SIO/2 Pin Functions
D0
D2
D4
D6
IORQ
CE
B/A
C/D
RD
GND
W/RDYB
RxDB
RxCB
TxCB
TxDB
DTRB
RTSB
CTSB
DCDB
RESET
UM008101-0601
Serial Input/Output