16F628 datasheet(118/168 Pages) MICROCHIP

118 / 168 page

PIC16F627A/628A/648A

DS40044A-page 116

Preliminary

 2002 Microchip Technology Inc.

CLRW

Clear W

Syntax:

[

label ] CLRW

Operands:

None

Operation:

00h

→ (W)

→ Z

Status Affected:

Encoding:

0001

0000

0011

Description:

W register is cleared. Zero bit

(Z) is set.

Words:

Cycles:

Example

CLRW

Before Instruction

W = 0x5A

After Instruction

W = 0x00

Z= 1

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

Watchdog Timer. It also resets

the prescaler of the WDT. Status

bits TO and PD are set.

Words:

Cycles:

Example

CLRWDT

Before Instruction

WDT counter = ?

After Instruction

WDT counter

= 0x00

WDT prescaler = 0

COMF

Complement f

Syntax:

[

label ] COMF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f)

→ (dest)

Status Affected:

Encoding:

1001

dfff

ffff

Description:

The contents of register 'f' are

complemented. If 'd' is 0 the

result is stored in W. If 'd' is 1 the

result is stored back in register

'f'.

Words:

Cycles:

Example

COMF

REG1, 0

Before Instruction

REG1 = 0x13

After Instruction

REG1 = 0x13

= 0xEC

DECF

Decrement f

Syntax:

[

label ] DECF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (dest)

Status Affected:

Encoding:

0011

dfff

ffff

Description:

Decrement register 'f'. If 'd' is 0

the result is stored in the W reg-

ister. If 'd' is 1 the result is stored

back in register 'f'.

Words:

Cycles:

Example

DECF

CNT, 1

Before Instruction

CNT = 0x01

Z= 0

After Instruction

CNT = 0x00

Z= 1

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