Intel MCS48 User Manual page 230

8155/8156/8155-2/8156-2
WAVEFORMS
a.
Read
Cycle
CE
(8155)
OR
CE
(8156)
7
X
X
7
X
7
\
X
7
£
X
>
—
q;
\
7
b.
Write Cycle
CE
(8155)
OR
CE
(8156)
\
7
\
s:
7
x
7
X
7
£
X
:cn
X
7
\
7
Figure
12.
8155/8156 Read/Write Timing Diagrams
6-78