U3 - S5 :: PROGRAMMABLE INTERRUPT CONTROLLER [8259]

The 8259 is known as the Programmable Interrupt Controller (PIC) microprocessor. In 8085 and 8086 there are five hardware interrupts and two hardware interrupts respectively. Bu adding 8259, we can increase the interrupt handling capability. This chip combines the multi-interrupt input source to single interrupt output. This provides 8-interrupts from IR0 to IR7. Let us see some features of this microprocessor.

This chip is designed for 8085 and 8086.

It can be programmed either in edge triggered, or in level triggered mode

We can mask individual bits of Interrupt Request Register.

By cascading 8259 chips, we can increase interrupts up to 64 interrupt lines

Clock cycle is not needed.

SUBSCRIBE BY FOLLOWING LINK