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CLRF Command:
Syntax:
Status Flags Effected:
CLRF
CLRF f
Z
CLRF clears the register (sets all bits to zero) specified by 'f'.

Code Example 1: Clear a register named TEMP.
CLRF    TEMP
Clear the register labeled TEMP.

CLRW Command:
Syntax:
Status Flags Effected:
CLRW
CLRW
Z

CLRW clears the working register (sets all bits to zero). CLRW is equivalent to the command MOVLW 0x00, though the MOVLW command does not effect any flags.


CLRWDT Command:
Syntax:
Status Flags Effected:
CLRWDT
CLRWDT
TO, PD

CLRWDT clears the watchdog timer. If you have the watchdog timer enabled, it's important to toss this command into your code frequently and most certainly in all loops. If the watchdog timers expires, the microcontroller will reset and begin executing code as if it had just been powered up.

Testing the TO and PD bits in the status register will help determin if the watchdog timer has expired and if the microcontroller has reset.

The specific of the embedded design will determine if the watchdog timer is needed or not. If the design is such where the application will be unattended for long period of time and data logging is required, then using the watchdog timer is advised.

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