PIC18F1220_07 Datasheet, PDF (209/308 Pages) Microchip Technology – 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology

PIC18F1220/1320
CLRF
Clear f
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
[ label ] CLRF f [,a]
0 ≤ f ≤ 255
a ∈ [0,1]
000h → f
1→Z
Z
0110 101a ffff ffff
Clears the contents of the specified
register. If ‘a’ is ‘0’, the Access
Bank will be selected, overriding
the BSR value. If ‘a’ = 1, then the
bank will be selected as per the
BSR value (default).
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Decode
Read
register ‘f’
Q3
Process
Data
Q4
Write
register ‘f’
Example:
CLRF
Before Instruction
FLAG_REG =
After Instruction
FLAG_REG =
FLAG_REG
0x5A
0x00
CLRWDT
Clear Watchdog Timer
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
[ label ] CLRWDT
None
000h → WDT,
000h → WDT postscaler,
1 → TO,
1 → PD
TO, PD
0000 0000 0000 0100
CLRWDT instruction resets the
Watchdog Timer. It also resets the
postscaler of the WDT. Status bits,
TO and PD, are set.
1
1
Q Cycle Activity:
Q1
Q2
Decode
No
operation
Q3
Process
Data
Q4
No
operation
Example:
CLRWDT
Before Instruction
WDT Counter
=
After Instruction
WDT Counter
=
WDT Postscaler =
TO
=
PD
=
?
0x00
0
1
1
© 2007 Microchip Technology Inc.
DS39605F-page 207