DM163006 datasheet(233/320 Pages) MICROCHIP

233 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 233

PIC18C601/801

CPFSGT

Compare f with WREG,

skip if f > WREG

Syntax:

[ label ] CPFSGT

f [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f)

− (WREG),

skip if (f) > (WREG)

(unsigned comparison)

Status Affected:

None

Encoding:

0110

010a

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

, then the fetched

instruction is discarded and a NOP

is executed instead, making this a

two-cycle instruction. If ’a’ is 0, the

Access Bank will be selected, over-

riding the BSR value. If ’a’ is 1, the

Bank will be selected as per the BSR

value.

Words:

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

CPFSGT REG

NGREATER

GREATER

Before Instruction

Address (HERE)

WREG

After Instruction

If REG

WREG;

Address (GREATER)

If REG

≤

WREG;

Address (NGREATER)

CPFSLT

Compare f with WREG,

skip if f < WREG

Syntax:

[ label ] CPFSLT

f [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) –

(WREG),

skip if (f) < (WREG)

(unsigned comparison)

Status Affected:

None

Encoding:

0110

000a

ffff

Description:

Compares the contents of data

memory location 'f' to the contents

of WREG by performing an

unsigned subtraction.

If the contents of 'f' are less 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’ is 0, the

Access Bank will be selected. If ’a’ is

1, the Bank will be selected as per

the BSR value.

Words:

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

CPFSLT REG

NLESS

LESS

Before Instruction

Address (HERE)

WREG

After Instruction

If REG

WREG;

Address (LESS)

If REG

≥

WREG;

Address (NLESS)

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