PIC18F2331/2431/4331/4431
CPFSGT
Compare f with W, Skip if f > W
CPFSLT
Compare f with W, Skip if f < W
Syntax:
[ label ] CPFSGT f [,a]
Syntax:
[ label ] CPFSLT f [,a]
Operands:
0 f 255
a [0,1]
Operands:
0 f 255
a [0,1]
Operation:
(f) W),
Operation:
(f) –W),
skip if (f) > (W)
skip if (f) < (W)
(unsigned comparison)
(unsigned comparison)
Status Affected:
Encoding:
None
Status Affected:
Encoding:
None
0110
010a
ffff
ffff
0110
000a
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 NOPis
executed instead, making this 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.
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 NOPis
executed instead, making this a
two-cycle instruction. If ‘a’ is ‘0’, the
Access Bank will be selected. If ‘a’ is ‘1’,
the BSR will not be overridden.
Words:
Cycles:
1
Words:
Cycles:
1
1(2)
1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
No
operation
Decode
Read
register ‘f’
Process
Data
No
operation
If skip:
Q1
If skip:
Q1
Q2
Q3
Q4
Q2
Q3
Q4
No
No
No
No
No
No
No
No
operation
operation
operation
operation
operation
operation
operation
operation
If skip and followed by 2-word instruction:
If skip and followed by 2-word instruction:
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
No
No
No
No
No
No
No
No
operation
operation
operation
operation
operation
operation
operation
operation
No
No
No
No
No
No
No
No
operation
operation
operation
operation
operation
operation
operation
operation
Example:
HERE
NLESS
LESS
CPFSLT REG
:
:
Example:
HERE
CPFSGT REG
NGREATER
GREATER
:
:
Before Instruction
Before Instruction
PC
W
=
=
Address (HERE)
?
PC
W
=
=
Address (HERE)
?
After Instruction
After Instruction
If REG
PC
If REG
PC
<
=
=
W;
If REG
PC
If REG
PC
=
=
W;
Address (LESS)
W;
Address (NLESS)
Address (GREATER)
W;
Address (NGREATER)
2010 Microchip Technology Inc.
DS39616D-page 301
MICROCHIP [ MICROCHIP ]
