AN247 datasheet(23/32 Pages) MICROCHIP

23 / 32 page

 2003 Microchip Technology Inc.

DS00247A-page 23

AN247

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

; This is a jump routine to branch to the appropriate memory access function.

; The high byte of the 24-bit pointer is used to determine which memory to access.

; All program memories (including Config and User IDs) are directly mapped.

; EEDATA is remapped.

_DataReg

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

_SetPointers

movf

_bootAddrU, W

; Copy upper pointer

movwf

TBLPTRU

andlw

0xF0

; Filter

movwf

WREG2

movf

_bootAddrH, W

; Copy the high pointer

movwf

TBLPTRH

movwf

EEADRH

movf

_bootAddrL, W

; Copy the low pointer

movwf

TBLPTRL

movwf

EEADR

btfss

MODE_AUTO_INC

; Adjust the pointer if auto inc is enabled

bra

_SetPointersJp1

movf

_bootCount, W

; add the count to the pointer

addwf

_bootAddrL, F

clrf

WREG

addwfc _bootAddrH, F

addwfc _bootAddrU, F

_SetPointersJp1

_Decode

movlw

0x30

; Program memory < 0x300000

cpfslt WREG2

bra

_DecodeJp1

#ifdef ALLOW_GET_CMD

btfsc

CAN_PG_BIT

bra

_PMRead

#endif

bra

_PMEraseWrite

_DecodeJp1

movf

WREG2,W

; Config memory = 0x300000

xorlw

0x30

bnz

_DecodeJp2

#ifdef ALLOW_GET_CMD

btfsc

CAN_PG_BIT

bra

_PMRead

#endif

bra

_CFGWrite

_DecodeJp2

movf

WREG2,W

; EEPROM data = 0xF00000

xorlw

0xF0

bnz

_CANMain

#ifdef ALLOW_GET_CMD

btfsc

CAN_PG_BIT

bra

_EERead

#endif

bra

_EEWrite

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

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