MSM82C55A-2GS View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
Manufacturer
MSM82C55A-2GS Datasheet PDF : 26 Pages
| |||
¡ Semiconductor
MSM82C55A-2RS/GS/VJS
Port C Function Allocation in Mode 1
Combination of
Input/Output
Port C
Group A: Input Group A: Input Group A: Output Group A: Output
Group B: Input Group B: Output Group B: Input Group B: Output
PC0
INTRB
INTRB
INTRB
INTRB
PC1
IBFB
OBFB
IBFB
OBFB
PC2
STBB
ACKB
STBB
ACKB
PC3
INTRA
INTRA
INTRA
INTRA
PC4
STBA
STBA
I/O
I/O
PC5
IBFA
IBFA
I/O
I/O
PC6
I/O
I/O
ACKA
ACKA
PC7
I/O
I/O
OBFA
OBFA
Note: I/O is a bit not used as the control signal, but it is available as a port of mode 0.
Examples of the relation between the control words and pins when used in mode 1 are
shown below:
(a) When group A is mode 1 output and group B is mode 1 input.
D7 D6 D5 D4 D3 D2 D1 D0
Control Word 1 0 1 0 1/0 1 1 ¥
Selection of I/O
of PC4 and PC5
when not defined
as a control pin.
1 = Input
0 = Output
As all of PC0 - PC3 bits
become a control pin
in this case, this bit is
"Don't Care".
PA7 - PA0 8
WR
PC7
OBFA
PC6
ACKA
PC3
PC4, PC5 2
PB7 - PB0 8
PC2
INTRA
I/O
STBB
Group A: Mode 1 Output
Group B: Mode 1 Input
RD
PC1
IBFB
PC0
INTRB
15/26
Share Link: 