DECF
Decrement f
Decrement register ‘f’. If ‘d’ is ‘0’, the result is stored in the W register. If ‘d’ is ‘1’, the result is stored back in register ‘f’.
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Syntax:
[ label ] DECF f,d
Operation:
(f) - 1 → (destination)
Operands:
- f is from 0 to 127 (decimal)
- d can be either 0 or 1
Status Affected: Z
Example:
DECF REG,0
Before instruction:
REG = 0x0A W = 0x01
After instruction:
REG = 0x0A W = 0x09
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Example:
COMF REG,1
Before instruction:
REG = 0x0A W = 0x01
After instruction:
REG = 0x09 W = 0x01
