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8259A PROGRAMMABLE INTERRUPT CONTROLLER …

December 1988 Order Number: 231468-0038259 APROGRAMMABLE INTERRUPT CONTROLLER ( 8259A / 8259A -2)Y8086, 8088 CompatibleYMCS-80, MCS-85 CompatibleYEight-Level Priority ControllerYExpandable to 64 LevelsYProgrammable INTERRUPT ModesYIndividual Request Mask CapabilityYSinglea5V Supply (No Clocks)YAvailable in 28-Pin DIP and 28-LeadPLCC Package(See Packaging Spec., Order 231369)YAvailable in EXPRESS Standard Temperature Range Extended Temperature RangeThe Intel 8259A PROGRAMMABLE INTERRUPT CONTROLLER handles up to eight vectored priority interrupts for the is cascadable for up to 64 vectored priority interrupts without additional circuitry. It is packaged in a 28-pinDIP, uses NMOS technology and requires a singlea5V supply. Circuitry is static, requiring no clock 8259A is designed to minimize the software and real time overhead in handling multi-level priority inter-rupts.

The interrupts at the IR input lines are handled by two registers in cascade, the Interrupt Request Reg-ister (IRR) and the In-Service (ISR). The IRR is used to store all the interrupt levels which are requesting service; and the ISR is used to store all the interrupt levels which are being serviced. PRIORITY RESOLVER

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