Datasheet

 1996 Microchip Technology Inc. DS30412C-page 119
PIC17C4X
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 an NOP is exe-
cuted instead making this a two-cycle
instruction.
Words: 1
Cycles: 1 (2)
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Execute NOP
If skip:
Q1 Q2 Q3 Q4
Forced NOP NOP Execute NOP
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' > the contents of
WREG then the fetched instruction is
discarded and an NOP is executed
instead making this a two-cycle instruc-
tion.
Words: 1
Cycles: 1 (2)
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Execute NOP
If skip:
Q1 Q2 Q3 Q4
Forced NOP NOP Execute NOP
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)