PIC16LC554 datasheet(56/96 Pages) MICROCHIP

56 / 96 page

PIC16C55X(A)

DS40143B-page 56

Preliminary

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 register. If 'd'

is 1 the result is stored back in register

'f'

Words:

Cycles:

Example

DECF

CNT, 1

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 register 'f'.

If the result is 0, the next instruction,

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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