Post by thread:saving/restoring state information

(Please excuse if this is in a FAQ somewhere, but I have yet to see it anywhere.) Is there a commonly accepted method of saving and restoring the state of the processor during interrupt routines? In particular, I'm interested in 16F8xx parts. Obviously I must save registers that I use, but saving and restoring the STATUS, etc. registers seems a little tricky. I've see numerous different implementations which *appear* to work, but I can't be certain for all possible states. Pointers anyone? Thanks.

JB wrote: > > (Please excuse if this is in a FAQ somewhere, but I have yet to see it > anywhere.) > > Is there a commonly accepted method of saving and restoring the state of > the processor during interrupt routines? In particular, I'm interested in > 16F8xx parts. Obviously I must save registers that I use, but saving and > restoring the STATUS, etc. registers seems a little tricky. I've see > numerous different implementations which *appear* to work, but I can't be > certain for all possible states. > > Pointers anyone? > > Thanks. movwf w_temp swapf status,w clrf status movwf status_temp movf pclath,w movwf pclath_temp clrf pclath bcf status,irp movf fsr,w movwf fsr_temp ; ISR movf pclath_temp,w movwf pclath swapf status_temp,w movwf status swapf w_temp swapf w_temp,w Reference 16F8XX data sheet pg 145 Funny how they forgot to restore the fsr register, and clearing status,irp twice. -- Best regards Tony http://www.picnpoke.com spam_OUTsalesTakeThisOuTpicnpoke.com

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