PIC18F258-ESLASHLSQTP datasheet(301/402 Pages) MICROCHIP

301 / 402 page

DS41159E-page 299

PIC18FXX8

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

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

NLESS

LESS

Before Instruction

Address (HERE)

After Instruction

If REG

Address (LESS)

If REG

≥

Address (NLESS)

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