AN247 datasheet(22/32 Pages) MICROCHIP

22 / 32 page

AN247

DS00247A-page 22

 2003 Microchip Technology Inc.

; *********************************************************

; This is the reset command.

xorlw

CMD_RESET

; RESET Command

btfsc

STATUS, Z

reset

; *********************************************************

; This is the Selfcheck reset command. This routine

; resets the internal check registers, i.e. checksum and

; self verify.

movf

_bootSpcCmd, W

; RESET_CHKSM Command

xorlw

CMD_RST_CHKSM

bnz

_SpecialCmdJp1

clrf

_bootChksmH

; Reset chksum

clrf

_bootChksmL

bcf

ERR_VERIFY

; Clear the error verify flag

; *********************************************************

; This is the Test and Run command. The checksum is

; verified, and the self-write verification bit is checked.

; If both pass, then the boot flag is cleared.

_SpecialCmdJp1

movf

_bootSpcCmd, W

; RUN_CHKSM Command

xorlw

CMD_CHK_RUN

bnz

_SpecialCmdJp2

movf

_bootChkL, W

; Add the control byte

addwf

_bootChksmL, F

bnz

_SpecialCmdJp2

movf

_bootChkH, W

addwfc _bootChksmH, F

bnz

_SpecialCmdJp2

btfsc

ERR_VERIFY

; Look for verify errors

bra

_SpecialCmdJp2

setf

EEADR

; Point to last location of EEDATA

setf

EEADRH

clrf

EEDATA

; and clear the data

movlw

b'00000100'

; Setup for EEData

rcall

_StartWrite

_SpecialCmdJp2

#ifdef ALLOW_GET_CMD

bra

_CANSendAck

; or send an acknowledge

#else

bra

_CANMain

#endif

; *****************************************************************************

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