Problem with using interrupts in dsPIC30F3011

[yokel]

Dear All,
I am a newbie. I am using dsPIC30F3011 interrupts. Problem is, say I have activated the ISR of int0 only, but that ISR of int0 always gets activated if I input (no matter 0 or 1) something in any other interrupts pins or some other pins of the MCU which has no relation with interrupt. Even the ISR is called if I touch those pins with any metal in stead of any 1/0 input.

This is the code I am using-


void InitINT(void)
{
INTCON2=0x0001; //the result is same whether I set 1 or 0 here

//External Interrupt 0
IEC0bits.INT0IE=1; //enable INT0 ISR
IFS0bits.INT0IF=0; //clear INT0 interrupt flag
IPC0bits.INT0IP = 4; // interrupt priority

return;
}

void __attribute__((interrupt, no_auto_psv)) _INT0Interrupt(void)
{
SendData('e'); // Send this to PC
IFS0bits.INT0IF=0; //clear INT0 interrupt flag
}


Please tell me all the possible reasons (in both firmware and hardware parts) behind it so that I can troubleshoot

with thanks,

 

[btbass]

interrupt dspic

How is the interrupt pin being driven?
Sounds like noise.
Do you have pull up or pull down resistor on the input pin?

 

[yokel]

external interrupt dspic

Yes.
Here the circuitry I am using

Please suggest me some possible reasons

 

[btbass]

dspic external interrupt c

What is the value of Resistor?

 

[Prabakaran]

set up isr dspic30f

Hi Yokel.

There is a special in Dspic u need to configure the interrupt as falling edge or rising edge and keep the Pin as in TTL output . So that any changes from logic 0 to Logic 1 only the intterupt occcurs. Please give me the feedback for the same.