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SILICON GATE MOS 8255
MODE
0 PORT DEFINITION CHART
A
B
GROUPA
GROUPB
04
PORTC
PORTC
03
01
DO
PORTA
(UPPER)
#
PORT B
(LOWER)
0
0
0 0
OUTPUT
OUTPUT
0 OUTPUT OUTPUT
0 0
0
1
OUTPUT OUTPUT
1
OUTPUT
INPUT
0 0
1
0
OUTPUT
OUTPUT
2
INPUT
OUTPUT
0
0
1
1
OUTPUT
OUTPUT
3
INPUT
INPUT
0 1
0
0
OUTPUT INPUT 4
OUTPUT
OUTPUT
0 1
0
1
OUTPUT INPUT
5
OUTPUT INPUT
0 1
1
0 OUTPUT
INPUT
6
INPUT
OUTPUT
0 1 1
1 OUTPUT
INPUT
7
INPUT
INPUT
1
0
0
0
INPUT
OUTPUT
8
OUTPUT
OUTPUT
1
0
0
1
INPUT OUTPUT
9
OUTPUT
INPUT
1
0
1
0
INPUT OUTPUT
10
INPUT
OUTPUT
1
0 1 1
INPUT OUTPUT
11
INPUT
INPUT
1
1
0
0
INPUT
INPUT
12
OUTPUT
OUTPUT
1 1
0
1 INPUT
INPUT
13 OUTPUT
INPUT
1
1
1
0
INPUT
INPUT
14
INPUT
OUTPUT
1 1
1
1 INPUT INPUT
15
INPUT
INPUT
MODE
0 CONFIGURATIONS
CONTROLWORD
#0
~
0
6
0
5
04
03
O
2
0,
DO
A
.1
8
8255
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,4
I
.
.
,4
,
B
.1
8
,
CONTROLWORO #1
07
06
05
0
4
0
3
02
0,
DO
CONTROL WORD
#2
D
7
0
6
05
04
03
02
0,
00
A
,8
,
8255
,4
c{
/4
---
,
B
.1
8
I
CONTROLWORD #3
07
0
6
0
5
0
4
D
3
O
2
0,
DO
A
8
PA
7
·pAo
8255
4
PC,-PC
4
°
7
-°
0
c{
°7·°0
;
,4
PC
3
·PC
O
8
Ps.,.PB
o
B
5-118
A
.1
8
-
,
8255
,4
-
.
.,
c{
,4
I
B
' 8
I
Ps.,.PB
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