PIC18F258-ESLASHSOSQTP datasheet(305/402 Pages) MICROCHIP

305 / 402 page

DS41159E-page 303

PIC18FXX8

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 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,

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

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, 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

INFSNZ REG

ZERO

NZERO

Before Instruction

Address (HERE)

After Instruction

REG

REG + 1

If REG

≠

Address (NZERO)

If REG

Address (ZERO)

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