82C55 datasheet(6/23 Pages) INTEL

Part #	82C55

Description	CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

PDF	23 Pages

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Manufacturer	INTEL [Intel Corporation]

Direct Link	http://www.intel.com

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6 / 23 page

82C55A

231256 – 7

Figure 7 Bit SetReset Format

Interrupt Control Functions

When the 82C55A is programmed to operate in

mode 1 or mode 2 control signals are provided that

can be used as interrupt request inputs to the CPU

The interrupt request signals generated from port C

can be inhibited or enabled by setting or resetting

the associated INTE flip-flop using the bit setreset

function of port C

This function allows the Programmer to disallow or

allow a specific IO device to interrupt the CPU with-

out affecting any other device in the interrupt struc-

ture

INTE flip-flop definition

(BIT-SET)INTE is SETInterrupt enable

(BIT-RESET)INTE is RESETInterrupt disable

Note

All Mask flip-flops are automatically reset during

mode selection and device Reset

82C55 Datasheet(PDF) 6 Page - Intel Corporation