PIC18F6520-I Datasheet, PDF (283/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D

PIC18F6520/8520/6620/8620/6720/8720
INCFSZ
Increment f, skip if 0
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
[ label ] INCFSZ f [,d [,a]
0 ≤ f ≤ 255
d ∈ [0,1]
a ∈ [0,1]
(f) + 1 → dest,
skip if result = 0
None
0011 11da ffff ffff
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’
(default).
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 will be selected, overriding
the BSR value. If ‘a’ = 1, then the
bank will be selected as per the
BSR value (default).
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
NZERO
ZERO
INCFSZ
:
:
CNT, 1, 0
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:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
[ label ] INFSNZ
0 ≤ f ≤ 255
d ∈ [0,1]
a ∈ [0,1]
(f) + 1 → dest,
skip if result ≠ 0
None
f [,d [,a]
0100 10da ffff ffff
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’
(default).
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 will be selected, overriding
the BSR value. If ‘a’ = 1, then the
bank will be selected as per the
BSR value (default).
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
ZERO
NZERO
INFSNZ REG, 1, 0
Before Instruction
PC
= Address (HERE)
After Instruction
REG = REG + 1
If REG ≠ 0;
PC
= Address (NZERO)
If REG = 0;
PC
= Address (ZERO)
 2004 Microchip Technology Inc.
DS39609B-page 281