PIC18F4539-ESLASHMLSQTP datasheet(231/322 Pages) MICROCHIP

231 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 229

PIC18FXX39

CPFSGT

Compare f with W, skip if f > W

Syntax:

[ label ] CPFSGT f [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f)

− (W),

skip if (f) > (W)

(unsigned comparison)

Status Affected:

None

Encoding:

0110

010a

ffff

Description:

Compares the contents of data

memory location 'f' to the contents

of the W by performing an

unsigned subtraction.

If the contents of 'f' are greater 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, overriding the BSR value.

If ‘a’ = 1, then the bank will be

selected as per the BSR value

(default).

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, 0

NGREATER

GREATER

Before Instruction

Address (HERE)

After Instruction

If REG

Address (GREATER)

If REG

≤

Address (NGREATER)

CPFSLT

Compare f with W, skip if f < W

Syntax:

[ label ] CPFSLT

f [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) –

(W),

skip if (f) < (W)

(unsigned comparison)

Status Affected:

None

Encoding:

0110

000a

ffff

Description:

Compares the contents of data

memory location 'f' to the contents

of W by performing an unsigned

subtraction.

If the contents of 'f' are less than

the contents of W, 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 BSR will not be overridden

(default).

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, 1

NLESS

LESS

Before Instruction

Address (HERE)

After Instruction

If REG

Address (LESS)

If REG

≥

Address (NLESS)

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