I'm using unsigned int... 16bit unsigned.


Quoting Scott <goldscott@gmail.com>:

>> Disassembly of the non-working code (with comments I've now added).
>> 0xc0 and 0xbf are the upper and lower bytes of S2 resp.
>
> Why are you using a 16-bit variable instead of an 8-bit (unsigned) variab=
le?
>
> The subwfb instruction is correct - you do want to subtract the borrow
> from the most significant byte calculation. What is confusing me is
> the MOVLW 0xff. If I were writing this in assembly, I would use MOVLW
> 0x00.
>
> -Scott
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