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AN247 Datasheet(PDF) 18 Page - Microchip Technology |
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AN247 Datasheet(HTML) 18 Page - Microchip Technology |
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18 / 32 page  AN247 DS00247A-page 18 2003 Microchip Technology Inc. ; ***************************************************************************** _STARTUPCODE 0x00 ; ***************************************************************************** bra _CANInit bra _StartWrite ; ***************************************************************************** _INTV_H CODE 0x08 ; ***************************************************************************** #ifdef NEAR_JUMP bra HIGH_INT_VECT #else goto HIGH_INT_VECT #endif ; ***************************************************************************** _INTV_L CODE 0x18 ; ***************************************************************************** #ifdef NEAR_JUMP bra LOW_INT_VECT #else goto LOW_INT_VECT #endif ; ***************************************************************************** ; ***************************************************************************** _CAN_IO_MODULE CODE ; ***************************************************************************** ; Function: VOID _StartWrite(WREG _eecon_data) ; ; PreCondition: Nothing ; Input: _eecon_data ; Output: Nothing. Self write timing started. ; Side Effects: EECON1 is corrupted; WREG is corrupted. ; Stack Requirements: 1 level. ; Overview: Unlock and start the write or erase sequence to protected ; memory. Function will wait until write is finished. ; ; ***************************************************************************** _StartWrite: movwf EECON1 btfss MODE_WRT_UNLCK ; Stop if write locked return movlw 0x55 ; Unlock movwf EECON2 movlw 0xAA movwf EECON2 bsf EECON1, WR ; Start the write nop btfsc EECON1, WR ; Wait (depends on mem type) bra $ - 2 return ; ***************************************************************************** |
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