< %27 2GTKRJGTCNU
7UGT /CPWCN
UM008101-0601
Serial Input/Output
220
Figure 107. Z80 SIO/3 Pin Assignments
34
33
IEI
IEO
M1
+5V
W/RDYA
N/C
SYNCA
RxDA
RxCA
TxCA
TxDA
CE
B/A
C/D
RD
GND
N/C
W/RDYB
SYNCB
RxDB
RxCB
TxCB
INT
D7
D5
D3
D1
N/C
D0
D2
D4
D6
IO
RQ
DT
RA
RT
S
A
CT
S
A
DCDA
CL
K
R
E
SET
DCDB
CT
S
B
RT
S
B
DT
RB
Tx
D
B
44
22
12
11
1
CMOS Z80
Z804C43
SIO/3
