Bob Ammerman wrote:

>  > Actually, his code compiles to bcf and bsf instructions, too, which
>>  are RMW instructions.  Perhaps that's the original source of his
>>  problems?
>
>Yes, but the bit being set or cleared is the one in question, so it can't
>cause the typical RMW problem. The RMW problem with BCF/BSF happens on
>_other_ bits within the same port.

Good -- now that's cleared up in my mind.

To bad the PIC doesn't have a btf (bit toggle flag) instruction -- in
that case PORTA ^= 0x40 would be the perfect solution.
--

  ______________________________________
   Andrew E. Kalman, Ph.D.   aek@pumpkininc.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body