Many thanks Jerson

(btw I used your ISR - much easier on the eye & it works a treat!)


One other quick question (to the forum in general) - I have the need for two more external momentary push switches to interface with my program ...I'd also like to use interupts with these - what other input pins can I use? (I've now used the INT_INT pin ...which is an external interupt), but to my untrained eye, it's not easy to establish which other PIC pins would be good contenders.

I'm using a 16F690.