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DM163006 Datasheet(PDF) 231 Page - Microchip Technology

Part # DM163006
Description  High-Performance ROM-less Microcontrollers
PDF  320 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DM163006 Datasheet(HTML) 231 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Advance Information
DS39541A-page 231
PIC18C601/801
CLRF
Clear f
Syntax:
[label] CLRF
f [,a]
Operands:
0
≤ f ≤ 255
a
∈ [0,1]
Operation:
000h
→ f
1
→ Z
Status Affected:
Z
Encoding:
0110
101a
ffff
ffff
Description:
Clears the contents of the specified
register. If ’a’ is 0, the Access Bank
will be selected, overriding the BSR
value. If ’a’ is 1, the Bank will be
selected as per the BSR value.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ’f’
Process
Data
Write
register ’f’
Example:
CLRF
FLAG_REG
Before Instruction
FLAG_REG
=
5Ah
Z=
?
After Instruction
FLAG_REG
=
00h
Z=
0
CLRWDT
Clear Watchdog Timer
Syntax:
[ label ] CLRWDT
Operands:
None
Operation:
000h
→ WDT,
000h
→ WDT postscaler,
1
→ TO,
1
→ PD
Status Affected:
TO, PD
Encoding:
0000
0000
0000
0100
Description:
CLRWDT
instruction resets the
Watchdog Timer. It also resets the
postscaler of the WDT. Status bits
TO and PD are set.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
Process
Data
No
operation
Example:
CLRWDT
Before Instruction
WDT counter
=
?
WDT postscaler
=
?
TO
=?
PD
=?
After Instruction
WDT counter
=
00h
WDT postscaler
=
0
TO
=1
PD
=1



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