Below is the code I am using on a PIC16F627 to clear
the EEPROM from address 0x000 to 0x07E (0x07F stores a
variable that is not to be deleted).  Sometimes it
works, sometimes it doesn't.  When the code doesn't
work, the loop is still running, it just doesn't exit
it, because no WDT reset ever occurs.  The PIC is
running 4MHz INTRC oscillator I/O function, and all
interrupts are disabled.

;start
        bsf     STATUS, RP0
        movlw   0x0FF
        movwf   EEDATA
        clrf    EEADR
nxtadr  bsf     EECON1, WREN
        movlw   0x055
        movwf   EECON2
        movlw   0x0AA
        movwf   EECON2
        bsf     EECON1, WR
        bcf     EECON1, WREN
        clrwdt
        incf    EEADR, F
        movlw   0x07F
        xorwf   EEADR, W
        btfss   STATUS, Z
        goto    nxtadr
        bcf     STATUS, RP0
;end

Thanks,

--Nick

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