Revision as of 14:40, 1 August 2014

Intro

In this tutorial we will look at 8051 Interrupts. Interrupts are useful in many cases wherein the process simply wants to continue doing it's main job and other units(timers or external events) seek its attention when required. In other words the microcontroller, need not monitor the timers, the serial communication or the external pins P3.2 and P3.3. Whenever an event related to these units occur, it is informed to microcontroller with the help of interrupts.

Basics

For the 8051 Microcontroller there are six interrupt sources as shown in the table below:

Table. 1: Interrupt Vector Table
Interrupt	ROM Location(Hex)	Pin	Flag Clearing
Reset	0000	9	Auto
External HW Interrupt 0 (INT0)	0003	P3.2(12)	Auto
Timer 0 Interrupt(TF0)	000B	-	Auto
External HW Interrupt 1 (INT1)	0013	P3.3(13)	Auto
Timer 1 Interrupt(TF1)	001B	-	Auto
Serial Com Interrupt(RI and TI)	0023	-	Program SW

Schematic

@@ Line 6: / Line 6: @@
 =Basics=
 For the 8051 Microcontroller there are six interrupt sources as shown in the table below:
 }}
+{| class="wikitable" style="text-align:center;background-color:#87A96B;margin: 1em auto 1em auto;"
+|+ Table. 1: Interrupt Vector Table
+|-
+!Interrupt||ROM Location(Hex)||Pin||Flag Clearing
+|-
+|Reset||0000||9||Auto
+|-
+|External HW Interrupt 0 (INT0)||0003||P3.2(12)||Auto
+|-
+|Timer 0 Interrupt(TF0)||000B||-||Auto
+|-
+|External HW Interrupt 1 (INT1)||0013||P3.3(13)||Auto
+|-
+|Timer 1 Interrupt(TF1)||001B||-||Auto
+|-
+|Serial Com Interrupt(RI and TI)||0023||-||Program SW
+|}
 [http://exploreembedded.com/wiki/images/4/47/Schematic_8051Interupt.pdf '''Schematic''']
 [[File:8051Interupt.JPG|680px]]

Difference between revisions of "6.8051 Interrupts"

Revision as of 14:40, 1 August 2014

Intro

Basics