Interrupt vector table: Difference between revisions

Revision as of 16:57, 25 June 2016

Revision as of 20:04, 13 July 2016

Line 18:

===="Predefined"====

The "predefined" method loads the [[program counter]] (PC) directly with the address of some entry inside the interrupt vector table. The [[jump table]] itself contains executable code. While in principle an extremely short interrupt handler could be stored entirely inside the interrupt vector table, in practice the code at each and every entry is "JMP address" where the address is the address of the interrupt service routine (ISR) for that interrupt. The Atmel AVR<ref>Roger L. Traylor. [http://web.engr.oregonstate.edu/~traylor/ece473/lectures/interrupts.pdf "Interrupts: AVR interrupt servicing"]</ref><ref> Gary Hill. [http://wwwweb.csulb.edu/~hill/ee346/Lectures/10_ATmega328P10%20ATmega328P%20Interrupts.pdf "Atmel AVR Interrupt and Timing Subsystems: ATMEGA328P interrupt vector table"]</ref> and all 8051 and Microchip microcontrollers<ref name="huang">{{cite book |last=Huang |first=Han-Wat |title=Pic Microcontroller: An Introduction to Software and Hardware Interfacing |url=http://books.google.com/books?id=CB9GaAU1dwsC&pg=PA247 |accessdate=22 April 2013 |year=2005 |publisher=Cengage Learning |isbn=978-1-4018-3967-3 |page=247}}</ref> use the predefined approach.

===="Fetch"====