PIC18F2680ISPQTP datasheet(381/482 Pages) MICROCHIP

381 / 482 page

Preliminary

DS39625C-page 379

PIC18F2585/2680/4585/4680

CPFSGT

Compare f with W, Skip if f > W

Syntax:

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 is selected.

If ‘a’ is ‘1’, the BSR is used to select the

GPR bank (default).

If ‘a’ is ‘0’ and the extended instruction

set is enabled, this instruction operates

in Indexed Literal Offset Addressing

mode whenever f

≤ 95 (5Fh). See

Section 25.2.3 “Byte-Oriented and

Bit-Oriented Instructions in Indexed

Literal Offset Mode” for details.

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:

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 is selected.

If ‘a’ is ‘1’, the BSR is used to select the

GPR bank (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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