> Subin John wrote:
>  > Re: [PIC]:Is there anyway I can use more than 4 external interrupts
> on a pic16f876
>  > without using any other extra IC's? I'll use 4 interrupts on rb0/int
> to rb3?

In addition to what Adam said, you should be able to use RB0 to
generate the IRQ and RB0-RB3 to identify the source. Assuming 4
positive-going signals, diode-OR the 4 sources to RB0 and also
connect 3 of them to RB1-RB3 respectively. Adding a diode, resistor
and capacitor would give you a simple sample-hold to preserve the
voltage from the source long enough to identify the source. Only 3
need this D-R-C, the fourth is on RB0. Set the pin as an output and
'0' it to discharge the capacitor, the re-set as an input

More info about your IRQ  sources would be helpful

=================================================

How to implement RB4-RB7 interrupt-on-change

http://www.microchip.com/download/appnote/devspec/16cxx/00552e.pdf

Useful, but can be troublesome if trying to r-w other PortB pins

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