A while back, there was a thread on PICs with UARTs etc, getting into 
     a lock-up state on brown-out, that a MCLR couldn't clear.
     
     Has anybody had a similar problem on PIC12C508/9s?
     Or would I probably be ok if I use a MAX811 or similar Micro 
     supervisor to put the PIC into reset when the supply is below 2.65V.?
     
     (The supply is a big cap that probably won't go to 0 volts in-between 
     power-ups)
     
     Thanks in advance,
     
                Steve Lawther
     
     PIC projects etc.:-
     
     http://ourworld.compuserve.com/steve_lawther/ucindex.htm