Disabeling interrupt

[Jan Lichtenbelt]

Hi All,

I want to use the INT-interrupt on port RB0 of 16F887A. But I want both high-to-low and low-to-high interrups.
Is the next set up possible:
1) enable INT interrupt on high-to-low with macro HtL.
2) if interrupt occursin macro HtL I increase a counter, disable the interrupt and enable a new interrupt on low-to-high with macro LtH,
3) the same for this macro HtL, increse a counter, disable the interrupt and start HtL intterupt again.

Kind reagrds

Jan Lichtenbelt

[Benj]

Hi Jan,

Yes this is possible as we use this mechanism for one of the RC5 receive options.

You can keep the interrupt enabled and simply use the lines of C code below to switch the INT operation.

option_reg.INTEDG = 0; //Set the INT0 interrupt to trigger on falling edge

option_reg.INTEDG = 1; //Set the INT0 interrupt to trigger on rising edge

[Jan Lichtenbelt]

Dear Ben,

Some like this, with the Timer2 Interrupt_Counter?

if test_bit(option_reg,INTEDG)
{
clear_bit(option_reg,INTEDG); //Set the INT0 interrupt to trigger on falling edge
FCV_INTERRUPT_COUNTER=0;
}
else
{
set_bit(option_reg,INTEDG) ; //Set the INT0 interrupt to trigger on rising edge
FCV_TIME_ON= FCV_INTERRUPT_COUNTER;
}
Kind regards

Jan

[Jan Lichtenbelt]

The RB0/INT interrupt works both on rising and falling edge in one macro, see attachment.