PIC18F4539-ESLASHMLSQTP datasheet(235/322 Pages) MICROCHIP

235 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 233

PIC18FXX39

INCFSZ

Increment f, skip if 0

Syntax:

[ label ] INCFSZ f [,d [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) + 1

→ dest,

skip if result = 0

Status Affected:

None

Encoding:

0011

11da

ffff

Description:

The contents of register 'f' are

incremented. If 'd' is 0, the result is

placed in W. If 'd' is 1, the result is

placed back in register 'f'. (default)

If the result is 0, the next instruc-

tion, which is already fetched, is

discarded, and a NOP is executed

instead, making it 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

Write to

destination

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

INCFSZ

CNT, 1, 0

NZERO

ZERO

Before Instruction

Address (HERE)

After Instruction

CNT

CNT + 1

If CNT

Address (ZERO)

If CNT

≠

Address (NZERO)

INFSNZ

Increment f, skip if not 0

Syntax:

[ label ] INFSNZ f [,d [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) + 1

→ dest,

skip if result

≠ 0

Status Affected:

None

Encoding:

0100

10da

ffff

Description:

The contents of register 'f' are

incremented. If 'd' is 0, the result is

placed in W. If 'd' is 1, the result is

placed back in register 'f' (default).

If the result is not 0, the next

instruction, which is already

fetched, is discarded, and a NOP is

executed instead, making it a two-

cycle instruction. If ‘a’ is 0, the

Access Bank will be selected, over-

riding 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

Write to

destination

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

INFSNZ

REG, 1, 0

ZERO

NZERO

Before Instruction

Address (HERE)

After Instruction

REG

REG + 1

If REG

≠

Address (NZERO)

If REG

Address (ZERO)

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