Post by thread:[PIC] Re: Bizarre Nop Behavior

I've had more strange results best given as good news and bad news (for me) Good news. The code works fine. Bad news. I don't know why (or why it didn't before). I tried the various suggestions that were made, including the one below, and nothing seemed to help. There were interrupts involved and turning them on or off still sent the code into neverland. In frustration I took copies of the code to my office to work on and all the versions worked fine. Interrupts, label or $-1 jump, PORTA, 4 pin, nops, no nops - all ok. My home machine is 433 MHz running Win 98 and MPLAB 7.1; my office machine runs Win200 and the MPLAB 7.1 taken off the same CD, using the same programmer, and running the code on the same chip, on the same breadboard. Doesn't make sense to me. This weekend I will take the code off the office machine, bring everything home, reprogram the chip, and see if it runs. >Funny... Do you have any interrupts running? Specifically interrupts >that might be using T0CKl (which is linked to PORTA,4)? These could >interrupt your code, and by the time they return (if they return) >PORTA might have changed state. Note that PORTA,4 is an exceedingly >odd port on the 16F84... You might want to try if the problem also >occurs on PORTA,3... Thanks for all the suggestions, they will be helpful to me in debugging future code. John Piccirillo