On Sun, 31 Jul 1994, Brian Read wrote:

> I didn't read all of your code & have not used the 57 ( I am using the '71)
> but I did check the '57 op-codes. A movf RTCC to W will set the Z flag but
> will also clear the prescaler. Could this tie in with your troubles, or have
> you allowed for it?
> 
> Good luck,
> Brian

Brian, I thought you may have hit the problem, but it does not appear 
so.  Firstly if the movf RTCC, w did change the prescaler, then the 
whole time would be out (and  my LED blinking each second would not be 
operational).  I did try resetting the prescaler after each operation 
with the RTCC, but this gave not change.

The Microchip data page is confusing.  It talks in note 4 of the 
instruction table, about the prescaler being reset, but is ambiguous. (to 
me atleast)

Thank you for responding.


regards

Gary Gaskell
DSTC 
Cooperative Research Centre for Distributed Systems Technology
Queensland University of Technology
Ph    +61-7-864 1051            FAX    +61-7-864 1282
Email gaskell@dstc.qut.edu.au   URL    http://ftp.dstc.edu.au/intro.html