Datasheet

 1998-2013 Microchip Technology Inc. DS30289C-page 209
PIC17C7XX
CPFSEQ
Compare f with WREG,
skip if f = WREG
Syntax: [ label ] CPFSEQ f
Operands: 0  f  255
Operation: (f) – (WREG),
skip if (f) = (WREG)
(unsigned comparison)
Status Affected: None
Encoding:
0011 0001 ffff ffff
Description:
Compares the contents of data memory
location 'f' to the contents of WREG by
performing an unsigned subtraction.
If 'f' = WREG, then the fetched instruc-
tion is discarded and a NOP is executed
instead, making this a two-cycle
instruction.
Words: 1
Cycles: 1 (2)
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
Example:
HERE CPFSEQ REG
NEQUAL :
EQUAL :
Before Instruction
PC Address = HERE
WREG = ?
REG = ?
After Instruction
If REG = WREG;
PC = Address (EQUAL)
If REG  WREG;
PC = Address (NEQUAL)
CPFSGT
Compare f with WREG,
skip if f > WREG
Syntax: [ label ] CPFSGT f
Operands: 0  f  255
Operation: (f) WREG),
skip if (f) > (WREG)
(unsigned comparison)
Status Affected: None
Encoding:
0011 0010 ffff ffff
Description:
Compares the contents of data memory
location 'f' to the contents of the WREG
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.
Words: 1
Cycles: 1 (2)
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
Example:
HERE CPFSGT REG
NGREATER :
GREATER :
Before Instruction
PC = Address (HERE)
WREG = ?
After Instruction
If REG > WREG;
PC = Address (GREATER)
If REG £ WREG;
PC = Address (NGREATER)