VTech Alphabert s Magic Readport User Manual download pdf (Page 29)

BM Dept., Govt. Engg. College, Gandhinagar Page 29

EXPERIMENT NO. 7

Aim: Generate external interrupt INT0 and INT1 by connecting push button switch. Glow LEDs

connected at port P1 one by one when interrupt INT0 occurs. LEDs should flash when interrupt

INT1 occurs.

Circuit Diagram:

Program:

org 00h

ajmp start

org 03h ; Vector location for External interrupt INT0

ajmp sequence ; Jump to sequence program

reti

org 13h ; Vector location for External interrupt INT1

ajmp flash ; Jump to flash program

reti

start: mov IE,#10000101B ;Enable External interrupts

setb IT1 ; Negative edge trigger for INT1

setb IT0 ; Negative edge trigger for INT0

mov P1,#00h ; Port P1 output port

flash: mov P1,#0ffh ; Make all LEDs OFF

acall delay

mov P1,#00h ; Make all LEDs ON

acall delay

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VTech Alphabert s Magic Readport User Manual Page 29