PIC17C752-08SLASHCL datasheet(207/328 Pages) MICROCHIP

207 / 328 page

DS30289A-page 207

PIC17C7XX

CPFSEQ

Compare f with WREG,

skip if f = WREG

Syntax:

[

label ] CPFSEQ

Operands:

≤ f ≤ 255

Operation:

(f) – (WREG),

skip if (f) = (WREG)

(unsigned comparison)

Status Affected:

None

Encoding:

0011

0001

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:

Cycles:

1 (2)

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

Example:

HERE

CPFSEQ REG

NEQUAL

EQUAL

Before Instruction

PC Address

HERE

WREG

REG

After Instruction

If REG

WREG;

Address (EQUAL)

If REG

≠

WREG;

Address (NEQUAL)

CPFSGT

Compare f with WREG,

skip if f > WREG

Syntax:

[

label ] CPFSGT

Operands:

≤ f ≤ 255

Operation:

(f)

− (WREG),

skip if (f) > (WREG)

(unsigned comparison)

Status Affected:

None

Encoding:

0011

0010

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 an NOP is

executed instead making this a

two-cycle instruction.

Words:

Cycles:

1 (2)

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

Example:

HERE

CPFSGT REG

NGREATER

GREATER

Before Instruction

Address (HERE)

WREG

After Instruction

If REG

WREG;

Address (GREATER)

If REG

≤

WREG;

Address (NGREATER)

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