PIC18F010 datasheet(115/176 Pages) MICROCHIP

115 / 176 page

 2001 Microchip Technology Inc.

Preliminary

DS41142A-page 113

PIC18F010/020

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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