NOT function using CPU12 processor

Question

Is there a code in the CPU12 processor that provides straightforward NOT functionality?

Logical NOT is not a common microprocessor feature. I suppose it could exist on some processor, but not any those that I've ever worked with. — Jim Mischel, Sep 30 '12 at 22:11
Jim, on a MIPS processor, there is a way to do this: slti dest_reg, src_reg, 1 is exactly equivalent to a logical not. 0 becomes 1 and all non-zero values become 0. — gary, Nov 12 '12 at 12:37

score 1 · Accepted Answer · answered Sep 30 '12 at 19:16

1

This should be the datasheet you're looking for. There is no logical NOT available, you'll have to code it yourself.

Freescale-CPU12-datasheet

answered Sep 30 '12 at 19:16

Avio

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score 0 · Answer 2 · answered Sep 30 '12 at 02:33

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COM, COMA and COMB look like they do what you're looking for; they calculate the one's complement for a memory location, the A or the B register, respectively.

answered Sep 30 '12 at 02:33

Omaha

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I'm looking for a logical NOT, not a bitwise NOT. ie. I do not want 10 to become 01, i want it to become 00. – fgda Asdfasdaf Sep 30 '12 at 03:48

NOT function using CPU12 processor

2 Answers2