UPD8259A-2 Datasheet (NEC) - PROGRAMMABLE INTERRUPT CONTROLLER

UPD8259A-2, PROGRAMMABLE INTERRUPT CONTROLLER

A positive transition on an IR input sets the corresponding bit in the Interrupt Request Register, and at the same time the INT

NEe Microcomputers, Inc.

NEe },PD8259A }'PD8259A-2 PROGRAMMABLE INTERRUPT CONTROLLER DESC RIPTI ON The NEC J.lPD8259A is a programmable interrupt controller directly compatible with the 8080A/8085A/8086/8088 microprocessors.

It can service eight levels of interrupts and contains on-chip logic to expand interrupt capabilities up to 64 levels with the addition of other J.lPD8259As.

The user is offered a selection of priority algorithms to tailor the priority processing to meet his system requi