Hello : I know some people on this list are dissapointed with 'portb interrupt on change' (RB4-RB7 in 18C452). I was thinking in (perhaps) use this feature so I want to hear their thoughts. Why I should avoid 'interrupt on change'? Are there any problems?. Maybe missing interrupts? Thank you all, Carlos. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu