PS I'm having a torrid time getting PIN 4 on a 12F683 to work as an digital output pin - this just so happens to be the MCLR pin - any top tips what might be my problem? if I use the same code but with a different pin in it's place it all works - so it's somethint unique to that pin 4 - I've tried the MCLRE_OFF in my config - it's driving me potty...
MCLR pins are INPUTS only when set to off.
From the data sheet.
4.2.5.4 GP3/MCLR/VPP
Figure 4-4 shows the diagram for this pin. The GP3 pin
is configurable to function as one of the following:
• a general purpose input
• as Master Clear Reset with weak pull-up