PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 452

• Manufacturer Part Number: PIC18F25J50
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F46J50 FAMILY
COMF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS39931D-page 452
Q Cycle Activity:
Before Instruction
After Instruction
Decode
REG
REG
W
Q1
=
=
=
register ‘f’
Complement f
COMF
0  f  255
d  [0,1]
a  [0,1]
f  dest
N, Z
The contents of register, ‘f’, are
complemented. If ‘d’ is ‘0’, the result is
stored in W. If ‘d’ is ‘1’, the result is
stored back in register, ‘f’ (default).
If ‘a’ is ‘0’, the Access Bank is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
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 28.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode”
1
1
COMF
Read
0001
Q2
13h
13h
ECh
f {,d {,a}}
11da
REG, 0, 0
Process
Data
Q3
ffff
for details.
destination
Write to
Q4
ffff
CPFSEQ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
If skip:
If skip and followed by 2-word instruction:
Before Instruction
After Instruction
operation
operation
operation
Decode
PC Address
W
REG
If REG
If REG
No
No
No
Q1
Q1
Q1
PC
PC
register ‘f’
operation
operation
operation
Compare f with W, Skip if f = W
CPFSEQ
0  f  255
a  [0,1]
(f) – (W),
skip if (f) = (W)
(unsigned comparison)
None
Compares the contents of data mem-
ory location, ‘f’, to the contents of W by
performing an unsigned subtraction.
If ‘f’ = W, then the fetched instruction is
discarded and a NOP is executed
instead, making this 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 (default).
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 28.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode”
1
1(2)
Note: 3 cycles if skip and followed
HERE
NEQUAL
EQUAL
Read
0110
No
No
No
Q2
Q2
Q2
=
=
=
=
=

=
 2011 Microchip Technology Inc.
by a 2-word instruction.
HERE
?
?
W;
Address (EQUAL)
W;
Address (NEQUAL)
f {,a}
001a
CPFSEQ REG, 0
:
:
operation
operation
operation
Process
Data
No
No
No
Q3
Q3
Q3
ffff
for details.
operation
operation
operation
operation
No
No
No
No
Q4
Q4
Q4
ffff