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..External Interrupt..INT0

Shaik Piebe

hello all,
I am working with AT89C51CC01 which based on 8051.
I had write one program of external interrupt. See the code as follows.

void ex0_isr (void) interrupt 0
{
        CCAP1H = 0x5A;  // 35% Duty Cycle
}
void main (void)
{

//Configure INT0 (external interrupt 0) to generate an interrupt on the falling-edge of /INT0 (P3.2).
//Enable the EX0 interrupt and then enable the global interrupt flag.

        CMOD = 0x02; // Setup PCA timer

        CL = 0x00;
        CH = 0x00;

        CCAP1H = 0x10; // 75% Duty Cycle
        CCAPM1 = 0x42; // Setup PCA module 1 in PWM mode.

        IT0 = 1;   //  falling edge on /INT0 (P3.2)
        EX0 = 1;   // Enable EX0 Interrupt
        EA = 1;    // Enable Global Interrupt Flag

        CR = 1; // Start PCA Timer.

        while (1)
        {
        }
}


In this code without interrupt Duty cycle of PWM signal is 75% and when interrupt occur then Duty cycle is 35%.
This program works perfectly.

Is there possible to after interrupt then after some time program run normally (Same like without interrupt).
For example i want after interrupt after 5 min i come again into the same program routin.

Please give ur suggestion related to this problem.

Thanks in advance

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