--=======20B452A9=======
Content-Type: text/plain; x-avg-checked=avg-ok-45CD04; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 8bit

Nick wrote;
>This would work only I need individual control of each line.  I've used
>BSF/BCF operations to do bit-banged SPI on a 16F84 before, and that
>worked just fine, it's hard to believe that I can't simply toggle some
>lines using those commands!

You can but you have the read-modify-write problem to deal with
if you use consecutive bsf/bcf instructions to the same I/O port.
Most times, a NOP or two between the bsf/bcf is all you need.

>Should I use some kind of shadow register, set the bit in there and then
>move it to PORTA?  Sounds extremely backwards and kludgy.

That's exactly the work-around a lot of programmers use.
Regards...

___________________________________________
David Duffy        Audio Visual Devices P/L
U8, 9-11 Trade St, Cleveland 4163 Australia
Ph: +61 7 38210362   Fax: +61 7 38210281
New Web: www.audiovisualdevices.com.au
___________________________________________

--=======20B452A9=======--

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