About this document
8259 Programmable Interrupt Controller by Jeslin John is a document available to read on EtoBox.
The 8259 PIC is a 28-pin programmable interrupt controller chip that can handle up to 8 external interrupts. It was later expanded to support up to 64 interrupt inputs. The PIC acts as a middleman between I/O devices and the microprocessor, forwarding interrupts to the microprocessor while providing the interrupt service routine address. When an interrupt occurs, the 8259 does not service it itself but instead notifies the microprocessor, which then requests the ISR address from the PIC.
- Author
- Jeslin John
- Language
- EN