Intel MCS48 User Manual page 322

8255A/8255A5
MODE
2
AND MODE
(INPUT)
CONTROL WORD
D
7
D
B
D
5
D
4
D
3
D
2
D,
D„
"R^<r
J
CO
-/
—
I/O
c
MODE
2
AND MODE
(OUTPUT)
CONTROL
WORD
D
7
D„
D
5
D
4
D
3
D
2
D,
D„
h
h
MXM
°
I
Q
H
J
PA,-PAo
OO
OBF
A
ACK
A
-/ "
I/O
>
MODE
2
AND MODE
1
(OUTPUT)
MODE
2
AND MODE
1
(INPUT)
CONTROL
WORD
D
7
D
6
D
5
D
4
D
3
D
2
D,
D„
JM
pc
3
PA
7
-PA„
PC
7
PC
6
<^>
PC
4
PC
5
PB
7
PB
PC,
PC
2
~
r
'>
V
PC
CONTROL WORD
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
h h
IXIXIX1
»
h
C*l
PA
7
-PAo
;
<
«
>
PC
7
N
v
"
61F
A
pc
6
PC
4
ACK
A
st¥
a
PC5
PB
7
-PB
C
^IBF
A
8
1
PC,
STBg
"
IBF
B
pc
•- INTR
Figure 14.
MODE
2
Combinations
8-32
00744A