Datasheet

 2009-2011 Microchip Technology Inc. DS39960D-page 453
PIC18F87K22 FAMILY
INCFSZ Increment f, Skip if 0
Syntax: INCFSZ f {,d {,a}}
Operands: 0
 f  255
d
 [0,1]
a
 [0,1]
Operation: (f) +
1  dest,
skip if result =
0
Status Affected: None
Encoding:
0011 11da ffff ffff
Description: The contents of register ‘f’ are
incremented. If ‘d’ is ‘
0’, the result is
placed in W. 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 a
NOP is executed instead, making
it a two-cycle instruction.
If ‘a’ is ‘
0’, the Access Bank is selected.
If ‘a’ is ‘
1’, the BSR is used to select the
GPR bank.
If ‘a’ is ‘
0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
95 (5Fh). See
Section 29.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode”
for details.
Words: 1
Cycles: 1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register ‘f’
Process
Data
Write to
destination
If skip:
Q1 Q2 Q3 Q4
No
operation
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
Q1 Q2 Q3 Q4
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
Example:
HERE INCFSZ CNT, 1, 0
NZERO :
ZERO :
Before Instruction
PC = Address
(HERE)
After Instruction
CNT = CNT + 1
If CNT =
0;
PC = Address
(ZERO)
If CNT  0;
PC = Address
(NZERO)
INFSNZ Increment f, Skip if Not 0
Syntax: INFSNZ f {,d {,a}}
Operands: 0
 f  255
d
 [0,1]
a
 [0,1]
Operation: (f) +
1  dest,
skip if result
 0
Status Affected: None
Encoding:
0100 10da ffff ffff
Description: The contents of register ‘f’ are
incremented. If ‘d’ is ‘
0’, the result is
placed in W. If ‘d’ is ‘
1’, the result is
placed back in register ‘f’.
If the result is not ‘
0’, the next
instruction which is already fetched is
discarded and a
NOP is executed
instead, making it a two-cycle
instruction.
If ‘a’ is ‘
0’, the Access Bank is selected.
If ‘a’ is ‘
1’, the BSR is used to select the
GPR bank.
If ‘a’ is ‘
0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
95 (5Fh). See
Section 29.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode”
for details.
Words: 1
Cycles: 1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register ‘f’
Process
Data
Write to
destination
If skip:
Q1 Q2 Q3 Q4
No
operation
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
Q1 Q2 Q3 Q4
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
Example:
HERE INFSNZ REG, 1, 0
ZERO
NZERO
Before Instruction
PC = Address
(HERE)
After Instruction
REG = REG + 1
If REG
 0;
PC = Address
(NZERO)
If REG = 0;
PC = Address
(ZERO)