> Problem occurs when reed opens again, a second or so later.
> The contact bounce creates a couple of rising and falling edges
> again, the latter of which trigger interrupts

Put a trap at the start of the ISR to test the state of the b0 pin.
Interrupts
are turned off on entry to the ISR, so further transitions on b0 will have
no
effect. If you don't want to run the ISR code then simply wait until the
bouncing has stopped and then jump to the retfie, which will re-enable
INTE for the next legitimate closure. Make sure to clear INTF before
leaving the ISR as the bouncing will set this flag, causing immediate
re-entry into the ISR as soon as retfie is executed and interrupts are
re-enabled

Alternatively a simple RC filter should get rid of most of the noise
so that b0 sees only one transition

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu