MSM82C55A-2GS View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM82C55A-2GS

CMOS programmable peripheral interface

Oki Electric Industry 

¡ Semiconductor

MSM82C55A-2RS/GS/VJS

INTR (Interrupt request output)

This signal is used to interrupt the CPU and its operation in the same as in mode 1. There

are two INTE flip-flops internally available for input and output to select either interrupt

of input or output operation. The INTE1 is used to control the interrupt request for output

operation and it can be reset by the bit set for PC6. INTE2 is used to control the interrupt

request for the input operation and it can be set by the bit set for PC4.

Mode 2 I/O Operation

INTE1

PC3

INTRA

PA7 8

PA0

PC7

OBFA

PC6

ACKA

WR

RD

INTE2

PC4

STBA

PC5

IBFA

Port C Function Allocation in Mode 2

Port C

PC0

PC1

PC2

PC3

PC4

PC5

PC6

PC7

Function

Confirmed to the Group B Mode

INTRA

STBA

IBFA

ACKA

OBFA

Following is an example of the relation between the control word and the pin when used in

mode 2.

When input in mode 2 for group A and in mode 1 for group B.

17/26

Share Link: