PIC17CR42-08/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC17CR42-08/SP

High-performance 8-Bit CMOS EPROM, ROM microcontroller

Microchip Technology 

PIC17C4X

CLRWDT

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Q1

Decode

Clear Watchdog Timer

[ label ] CLRWDT

None

00h → WDT

0 → WDT postscaler,

1 → TO

1 → PD

TO, PD

0000 0000 0000 0100

CLRWDT instruction resets the watchdog

timer. It also resets the prescaler of the

WDT. Status bits TO and PD are set.

1

1

Q2

Read

register

ALUSTA

Q3

Execute

Q4

NOP

Example:

CLRWDT

Before Instruction

WDT counter

=

After Instruction

WDT counter

=

WDT Postscaler =

TO

=

PD

=

?

0x00

0

1

1

COMF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Q1

Decode

Complement f

[ label ] COMF f,d

0 ≤ f ≤ 255

d ∈ [0,1]

( f ) → (dest)

Z

0001 001d ffff ffff

The contents of register 'f' are comple-

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

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

back in register 'f'.

1

1

Q2

Read

register 'f'

Q3

Execute

Q4

Write

register 'f'

Example:

COMF

Before Instruction

REG1 = 0x13

After Instruction

REG1 = 0x13

WREG = 0xEC

REG1,0

DS30412C-page 118

© 1996 Microchip Technology Inc.

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