PIC17C44-08SLASHP datasheet(119/240 Pages) MICROCHIP

119 / 240 page

DS30412C-page 119

PIC17C4X

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

Execute

NOP

If skip:

Forced NOP

NOP

Execute

NOP

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' > the contents of

WREG then the fetched instruction is

discarded and an NOP is executed

instead making this a two-cycle instruc-

tion.

Words:

Cycles:

1 (2)

Q Cycle Activity:

Decode

Read

Execute

NOP

If skip:

Forced NOP

NOP

Execute

NOP

Example:

HERE

CPFSGT REG

NGREATER

GREATER

Before Instruction

Address (HERE)

WREG

After Instruction

If REG

WREG;

Address (GREATER)

If REG

≤

WREG;

Address (NGREATER)

PIC17C44-08/P Datasheet(PDF) 119 Page - Microchip Technology

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