> I have a problem using 16C621 A  parts.   I finished development w/
>F84's now I'm converting to the '621 and checking out the code.  I added a
>step to set the CMCON register to 0x05 (all digital  comparators).  It
works
>great with my emulator (ICE2000 w/ PCM16XC0), but when I program them
>individually, they seem to get stuck somewhere after initialization of RAM,
>ports and option register and before the main code.
>    Any thoughts?

When I migrated code from the 'F84 to the 16C622 I had a similar problem. I
fixed it by turning the comparators off (0x05 will give you a comparator on
A1 and A2 which might be causing the problem).

  MOVLW 0x07               ;Turn comparators off and enable
  MOVWF CMCON        ;pins for I/O function
...rest of port A set up here


James Hillman

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