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Thread: How to do 24bit Signed Addition/Substration Fixed point.
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face BY : James Lee Williams email (remove spam text)



Hello,

Can someone please tell be how I can do signed 24bit fixed point
addition and substration of the PIC micro controllers.  Everything that
I have seen is for unsigned addition and substraction.  At the moment,
for subtraction, I compliment the result if the carry is clear on the
last subtract of the highest byte.  (Meaning it had to borrow.).  This
seems to give me the correct result, but I don't know if it is the best
or most efficient way to do it for subtraction.

Regards,

James

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Subject (change) How to do 24bit Signed Addition/Substration Fixed point.

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