DM163006 datasheet(237/320 Pages) MICROCHIP

237 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 237

PIC18C601/801

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 incre-

mented. If ’d’ is 0, the result is placed

in WREG. 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 dis-

carded, 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’ is 1, the Bank

will be selected as per the BSR

value.

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

PC =

Address (ZERO)

If CNT

≠

PC =

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 incre-

mented. If 'd' is 0, the result is placed

in WREG. If 'd' is 1, the result is

placed back in register 'f' (default).

If the result is not 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’ is 1, the Bank

will be selected as per the BSR

value.

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

≠

PC =

Address (NZERO)

If REG

PC =

Address (ZERO)

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