
2002 Microchip Technology Inc.
DS41159B-page 295
PIC18FXX8
CPFSGT
Example:
CPFSLT
Example:
Compare f with W, skip if f > W
Syntax:
Operands:
[
label
] CPFSGT f [,a]
0
≤
f
≤
255
a
∈
[0,1]
(f)
(
W),
skip if (f) > (W)
(unsigned comparison)
None
Operation:
Status Affected:
Encoding:
Description:
0110
010a
ffff
ffff
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(chǎn)’ is
0, the Access Bank will be
selected, overriding the BSR value.
If ‘a(chǎn)’ = 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.
Words:
Cycles:
Q Cycle Activity:
Q1
Q2
Read
register ’f’
Q3
Q4
No
Decode
Process
Data
operation
If skip:
Q1
No
Q2
No
Q3
No
Q4
No
operation
operation
operation
operation
If skip and followed by 2-word instruction:
Q1
No
operation
operation
No
operation
operation
Q2
No
Q3
No
Q4
No
operation
No
operation
operation
No
operation
No
HERE CPFSGT REG
NGREATER :
GREATER :
Before Instruction
PC
W
After Instruction
If REG
=
=
Address
(HERE)
>
=
≤
=
W;
Address
(GREATER)
W;
Address
(NGREATER)
PC
If REG
PC
Compare f with W, skip if f < W
Syntax:
Operands:
[
label
] CPFSLT f [,a]
0
≤
f
≤
255
a
∈
[0,1]
(f) –
(
W),
skip if (f) < (W)
(unsigned comparison)
None
Operation:
Status Affected:
Encoding:
Description:
0110
000a
ffff
ffff
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(chǎn)’ is 0, the
Access Bank will be selected. If ’a’
is 1, the BSR will not be overridden
(default).
1
1(2)
Note:
3 cycles if skip and followed
by a 2-word instruction.
Words:
Cycles:
Q Cycle Activity:
Q1
Q2
Read
register ’f’
Q3
Q4
No
Decode
Process
Data
operation
If skip:
Q1
No
Q2
No
Q3
No
Q4
No
operation
operation
operation
operation
If skip and followed by 2-word instruction:
Q1
No
operation
operation
No
operation
operation
Q2
No
Q3
No
Q4
No
operation
No
operation
operation
No
operation
No
HERE CPFSLT REG
NLESS :
LESS :
Before Instruction
PC
W
After Instruction
If REG
PC
If REG
PC
=
=
Address
(HERE)
<
=
≥
=
W;
Address
(LESS)
W;
Address
(NLESS)