Hi,

Thanks Darrel. I understand that. I need to study how PBP works internally. (Don't know when I will get time to do that.) My need for the ISR was the speed so I will not anyway like to use PBP inside the ISR. However while developing and testing program flow it comes handy to do a little "IF-THENs" then port them to asm. BTW I could not find out if PBP uses the additional instructions that PIC18 supports. Like the compare and multiply instructions. I am finding that most of times I have to use asm blocks to optimize speed.