PIC18CXX2_13 Datasheet, PDF (204/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
COMF
Complement f
Syntax:
[ label ] COMF f [,d [,a]
Operands:
0  f  255
d  [0,1]
a  [0,1]
Operation:
( f )  dest
Status Affected: N,Z
Encoding:
0001 11da ffff ffff
Description:
The contents of register 'f' are com-
plemented. If 'd' is 0, the result is
stored in WREG. If 'd' is 1, the
result is stored back in register 'f'
(default). 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).
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Decode
Read
register 'f'
Example:
COMF
Q3
Q4
Process
Data
Write to
destination
REG, 0, 0
Before Instruction
REG
= 0x13
After Instruction
REG
= 0x13
WREG = 0xEC
CPFSEQ
Compare f with WREG,
skip if f = WREG
Syntax:
Operands:
[ label ] CPFSEQ f [,a]
0  f  255
a  [0,1]
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
(f) – (WREG),
skip if (f) = (WREG)
(unsigned comparison)
None
0110 001a ffff ffff
Compares the contents of data
memory location 'f' to the contents
of WREG by performing an
unsigned subtraction.
If 'f' = WREG, 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 will be selected, over-
riding the BSR value. If ‘a’ = 1, then
the bank will be selected as per the
BSR value (default).
1
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
No
operation
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
NEQUAL
EQUAL
CPFSEQ REG, 0
:
:
Before Instruction
PC Address =
WREG
=
REG
=
After Instruction
HERE
?
?
If REG
PC
If REG
PC
= WREG;
= Address (EQUAL)
 WREG;
= Address (NEQUAL)
DS39026D-page 204
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