82C55A Intersil Corporation, 82C55A Datasheet - Page 12

• Manufacturer Part Number: 82C55A
• Description: CMOS Programmable Peripheral Interface
• Manufacturer: Intersil Corporation

MODE 2 AND MODE 0 (INPUT)
MODE 2 AND MODE 1 (OUTPUT)
CONTROL WORD
D7
CONTROL WORD
D7
1
1
D6 D5 D4 D3 D2 D1 D0
D6 D5 D4 D3 D2 D1 D0
1
1
PC2-PC0
1 = INPUT
0 = OUTPUT
RD
WR
RD
WR
0
1
1
0
1/0
PC2-PC0
PB7-PB0
PB7-PB0
PA7-PA0
PA7-PA0
FIGURE 14. MODE 2 COMBINATIONS
PC3
PC7
PC6
PC4
PC5
PC3
PC7
PC6
PC4
PC5
PC1
PC2
PC0
8
3
8
8
8
INTRA
OBFA
ACKA
STBA
IBFA
INTRA
OBFA
ACKA
STBA
IBFA
OBFB
ACKB
INTRB
82C55A
I/O
12
MODE 2 AND MODE 0 (OUTPUT)
MODE 2 AND MODE 1 (INPUT)
CONTROL WORD
D7
CONTROL WORD
D7
1
1
D6 D5 D4 D3 D2 D1 D0
D6 D5 D4 D3 D2 D1 D0
1
1
PC2-PC0
1 = INPUT
0 = OUTPUT
RD
WR
RD
WR
0
1
0
1
1/0
PB7, PB0
PC2-PC0
PB7-PB0
PA7-PA0
PA7-PA0
PC3
PC7
PC6
PC4
PC5
PC3
PC7
PC6
PC4
PC5
PC2
PC1
PC0
8
3
8
8
8
INTRA
OBFA
ACKA
STBA
IBFA
INTRA
OBFA
ACKA
STBA
IBFA
STBB
IBFB
INTRB
I/O