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AVR external interrupt 0 problem

Discussion in 'Microcontrollers, Programming and IoT' started by saurabh17g, Apr 26, 2010.

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  1. saurabh17g


    Mar 8, 2010
    Please read the program below:
    #include <mega32.h>

    // External Interrupt 0 service routine
    interrupt [EXT_INT0] void ext_int0_isr(void)
    PORTC = 0xaa;


    // Declare your global variables here

    void main(void)

    // External Interrupt(s) initialization
    // INT0: On
    // INT0 Mode: Falling Edge
    // INT1: Off
    // INT2: Off

    // Global enable interrupts
    DDRC = 0xff;//configuring PORTC as output to test
    while (1)
    // Place your code here



    according to the program pasted above, the PORTC pins should give output 0xaa only when INT0 pin gets a falling edge. But in my case, PORTC is enabled forever. I have tried multiple combinations like level triggered , rising edge etc.. but all are giving the same output. Please reply.
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