PIC16LC924-08/CL 데이터 시트보기 (PDF) - Microchip Technology

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PIC16LC924-08/CL

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

PIC16C9XX

CLRWDT

Clear Watchdog Timer

Syntax:

[ label ] CLRWDT

Operands:

None

Operation:

00h → WDT

0 → WDT prescaler,

1 → TO

1 → PD

Status Affected: TO, PD

Encoding:

00 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:

1

Cycles:

1

Q Cycle Activity:

Q1

Q2

Q3

Q4

Decode

No-

Process

Operation data

Clear

WDT

Counter

Example

CLRWDT

Before Instruction

WDT counter =

After Instruction

WDT counter =

WDT prescaler=

TO

=

PD

=

?

0x00

0

1

1

COMF

Complement f

Syntax:

[ label ] COMF f,d

Operands:

0 ≤ f ≤ 127

d ∈ [0,1]

Operation:

(f) → (destination)

Status Affected: Z

Encoding:

00 1001 dfff ffff

Description:

The contents of register 'f' are comple-

mented. If 'd' is 0 the result is stored in

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

register 'f'.

Words:

1

Cycles:

1

Q Cycle Activity:

Q1 Q2 Q3

Q4

Decode

Read

register

'f'

Process Write to

data destination

Example

COMF

REG1,0

Before Instruction

REG1 =

After Instruction

REG1 =

W

=

0x13

0x13

0xEC

DECF

Decrement f

Syntax:

[label] DECF f,d

Operands:

0 ≤ f ≤ 127

d ∈ [0,1]

Operation:

(f) - 1 → (destination)

Status Affected: Z

Encoding:

00 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:

1

Cycles:

1

Q Cycle Activity:

Q1 Q2 Q3

Q4

Decode

Read

register

'f'

Process Write to

data destination

Example

DECF CNT, 1

Before Instruction

CNT =

Z

=

After Instruction

CNT =

Z

=

0x01

0

0x00

1

DS30444E - page 126

© 1997 Microchip Technology Inc.

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