PIC16F84A datasheet(58/124 Pages) MICROCHIP

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PIC16F8X

DS30430C-page 58

CLRF

Clear f

Syntax:

[

label] CLRF

Operands:

≤ f ≤ 127

Operation:

00h

→ (f)

→ Z

Status Affected:

Encoding:

0001

1fff

ffff

Description:

The contents of register 'f' are cleared

and the Z bit is set.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

'f'

Process

data

Write

Example

CLRF

FLAG_REG

Before Instruction

FLAG_REG

0x5A

After Instruction

FLAG_REG

0x00

CLRW

Clear W

Syntax:

[

label ] CLRW

Operands:

None

Operation:

00h

→ (W)

→ Z

Status Affected:

Encoding:

0001

0xxx

xxxx

Description:

W register is cleared. Zero bit (Z) is

set.

Words:

Cycles:

Q Cycle Activity:

Decode

No-Opera

tion

Process

data

Write to

Example

CLRW

Before Instruction

0x5A

After Instruction

0x00

CLRWDT

Clear Watchdog Timer

Syntax:

[

label ] CLRWDT

Operands:

None

Operation:

00h

→ WDT

→ WDT prescaler,

→ TO

→ PD

Status Affected:

TO, PD

Encoding:

0000

0110

0100

Description:

CLRWDT

instruction resets the Watch-

dog Timer. It also resets the prescaler

of the WDT. Status bits TO and PD are

set.

Words:

Cycles:

Q Cycle Activity:

Decode

No-Opera

tion

Process

data

Clear

WDT

Counter

Example

CLRWDT

Before Instruction

WDT counter =

After Instruction

WDT counter =

0x00

WDT prescaler=

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