Datasheet

 2010-2012 Microchip Technology Inc. DS39977F-page 501
PIC18F66K80 FAMILY
CPFSGT Compare f with W, Skip if f > W
Syntax: CPFSGT f {,a}
Operands: 0
 f  255
a
 [0,1]
Operation: (f) –
W),
skip if (f) > (W)
(unsigned comparison)
Status Affected: None
Encoding:
0110 010a ffff ffff
Description: Compares the contents of data memory
location ‘f’ to the contents of the W by
performing an unsigned subtraction.
If the contents of ‘f’ are greater than the
contents of 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 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
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 CPFSGT REG, 0
NGREATER :
GREATER :
Before Instruction
PC = Address
(HERE)
W= ?
After Instruction
If REG
 W;
PC = Address
(GREATER)
If REG  W;
PC = Address
(NGREATER)
CPFSLT Compare f with W, Skip if f < W
Syntax: CPFSLT f {,a}
Operands: 0
 f  255
a
 [0,1]
Operation: (f) –
W),
skip if (f) < (W)
(unsigned comparison)
Status Affected: None
Encoding:
0110 000a ffff ffff
Description: Compares the contents of data memory
location ‘f’ to the contents of W by
performing an unsigned subtraction.
If the contents of ‘f’ are less than the
contents of 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.
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
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 CPFSLT REG, 1
NLESS :
LESS :
Before Instruction
PC = Address
(HERE)
W= ?
After Instruction
If REG < W;
PC = Address
(LESS)
If REG  W;
PC = Address
(NLESS)