PIC16C925SLASHCL datasheet(123/182 Pages) MICROCHIP

123 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 121

PIC16C925/926

DECF

Decrement f

Syntax:

[ label ] DECF f [,d]

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (destination)

Status Affected:

Encoding:

0011

dfff

ffff

Description:

Decrement register ’f’. If ’d’ is 0, the

result is stored in the W register. If ’d’

is 1, the result is stored back in

Words:

Cycles:

Q Cycle Activity:

Decode

Read

’f’

Process

data

Write to

destination

Example

DECF

CNT,

Before Instruction:

CNT

0x01

After Instruction:

CNT

0x00

DECFSZ

Decrement f, Skip if 0

Syntax:

[ label ] DECFSZ f [,d]

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (destination);

skip if result = 0

Status Affected:

None

Encoding:

1011

dfff

ffff

Description:

The contents of register ’f’ are decre-

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

in the W register. If ’d’ is 1, the result

is placed back in register ’f’.

If the result is 1, the next instruction is

executed. If the result is 0, then a NOP

is executed instead, making it a 2TCY

instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

Decode

Read

Process

data

Write to

destination

If Skip: (2nd Cycle)

Operation

Example

HERE

DECFSZ

CNT, 1

GOTO

LOOP

CONTINUE

•

Before Instruction:

PC =

address HERE

After Instruction:

CNT

CNT - 1

if CNT

address CONTINUE

if CNT

≠

address HERE+1

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