PIC Math Negate 16 bit

Two's complemnt of a 16 bit word (2 bytes)

comf var,f ;Complement all bytes comf var+1,f incf var,f ;Inc. low byte always skpnz ;Skip if no carry to higher bytes incf var+1,f ;Carry to next byte

Questions:

Shouldn't the skpnz be skpnc? Ken R Helberg of Altec Lansing replies: incf doesn't affect the carry flag, so skpnz is correct.+

Comments:

If I'm not mistaken, the three last lines could be replaced with

incfsz var,F
incf var+1,F+

file: /Techref/microchip/math/neg/16bit.htm, 1KB, , updated: 2011/4/21 03:23, local time: 2024/11/20 01:10,

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PIC Microcontoller Math Method

Two's complemnt of a 16 bit word (2 bytes)