PIC12C67X datasheet(75/129 Pages) MICROCHIP

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DS30561B-page 75

PIC12C67X

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=

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 regis-

ter. If ’d’ is 1, the result is stored

back in register ’f’.

Words:

Cycles:

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

→ (dest);

skip if result = 0

Status Affected:

None

Encoding:

1011

dfff

ffff

Description:

The contents of register ’f’ are

decremented. If ’d’ is 0, the result

is placed in the W register. If ’d’ is

1, the result is placed back in reg-

ister ’f’.

If the result is 0, the next instruc-

tion, which is already fetched, is

discarded. A NOP is executed

instead making it a two cycle

instruction.

Words:

Cycles:

1(2)

Example

HERE

DECFSZ

CNT, 1

GOTO

LOOP

CONTINUE •

•

Before Instruction

address HERE

After Instruction

CNT

CNT - 1

if CNT =

address CONTINUE

if CNT

≠

address HERE+1

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