Syntax : INCFSZ f,d
Description : Increments 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'.
If the result is 0 the next instruction is skipped.
If the result is 0, the next instruction, which is
already fetched, is discarded. A NOP is executed instead,
making it a two cycles instruction.
| 00 | 1111 | dfff | ffff |