Datasheet

 1996 Microchip Technology Inc. DS30412C-page 123
PIC17C4X
INCF Increment f
Syntax: [
label ] INCF f,d
Operands: 0 ≤ f ≤ 255
d ∈ [0,1]
Operation: (f) + 1 → (dest)
Status Affected: OV, C, DC, Z
Encoding:
0001 010d ffff ffff
Description:
The contents of register 'f' are incre-
mented. If 'd' is 0 the result is placed in
WREG. If 'd' is 1 the result is placed
back in register 'f'.
Words: 1
Cycles: 1
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Execute Write to
destination
Example:
INCF CNT, 1
Before Instruction
CNT = 0xFF
Z=0
C=?
After Instruction
CNT = 0x00
Z=1
C=1
INCFSZ Increment f, skip if 0
Syntax: [
label ] INCFSZ f,d
Operands: 0 ≤ f ≤ 255
d ∈ [0,1]
Operation: (f) + 1 → (dest)
skip if result = 0
Status Affected: None
Encoding:
0001 111d ffff ffff
Description:
The contents of register 'f' are incre-
mented. If 'd' is 0 the result is placed in
WREG. If 'd' is 1 the result is placed
back in register 'f'.
If the result is 0, the next instruction,
which is already fetched, is discarded,
and an NOP is executed instead making
it a two-cycle instruction.
Words: 1
Cycles: 1(2)
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Execute Write to
destination
If skip:
Q1 Q2 Q3 Q4
Forced NOP NOP Execute NOP
Example:
HERE INCFSZ CNT, 1
NZERO :
ZERO :
Before Instruction
PC = Address (HERE)
After Instruction
CNT = CNT + 1
If CNT = 0;
PC = Address(ZERO)
If CNT ≠ 0;
PC = Address(NZERO)