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This moment's ARGH... WTF??? by MrTrick 2007-08-08 21:23:38
Contrary to what I learned in primary school, 12 - 1 = 5.
At least that's what my microcontroller thinks.

For some bizarro reason, the order of arguments is in reverse. For instance, if you want to subtract 0x10 from 0xC0, this: 

movlw    0xC0   ; foo = 0xC0
movwf    foo
...
movfw    foo    ; Put foo into the W register,
sublw    0x10   ; and subtract 0x10 from it.
Ends up with 0x50 in the W register.
You have to do it like this: 
movlw    0x10 
subwf    foo

[ Reply ]
  No that is correct by Karl-Henrik2007-08-09 00:04:36

 

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