Post by thread:12c508a

Hello all! Will a program end (until power is disconnected and re-applied ) for example: call _200ms delay bcf gpio,2 ;The program ends here, the next time the program should run is when power (which may be applied for up to 20 hours) is disconnected and re-applied (gpios, no wake up, no pullup) Should I put the pic into sleep after bcf gpio,2 ? or will the pic stop until reset ? should I fill any unused locations? if so how? Using picstart plus firmware1.5 " read the books, now I am learning" come back AC128'S and EL34'S <G> Thanks in advance! Kev

hello kev, you can use the mclr switch as a sort of an interrupt that will not force a cold boot but it means you cant also use a low battery reset, i think. it requires setting some flags to detect the sleeping condition so that the mclr wakeup is processed correctly. this is a bit tricky to get to work. IIRC, the 12c508s go to the origin both after sleep and after an mclr event, so the parsing routine has to be there. alice {Quote hidden}> Hello all! > > Will a program end (until power is disconnected and re-applied ) > for example: > > call _200ms delay > bcf gpio,2 ;The program ends here, the next time the program should run > is when power (which may be applied for up to 20 hours) is disconnected and > re-applied > > (gpios, no wake up, no pullup) > > Should I put the pic into sleep after bcf gpio,2 ? or will the pic stop until > reset ? > should I fill any unused locations? if so how? > > Using picstart plus firmware1.5 > > " read the books, now I am learning" > > come back AC128'S and EL34'S <G> > > Thanks in advance! > > Kev >

Kev Howard wrote: > Should I put the pic into sleep after bcf gpio,2? or will the pic > stop until reset? The PIC stops when you tell it to (by a SLEEP). Un-programmed locations execute a code which does nothing in particular, and the PC loops around to the start, so if you simply stop placing instructions at the end of your code it goes right on and restarts the whole program. And again... And again... And again... And again... Unsuspecting programmers writing programs they think are looping often get tricked by the thing looping, but not doing *quite* what they expected. > should I fill any unused locations? if so how? No. If you tell it to SLEEP, it does, and what follows has no effect. -- Cheers, Paul B.