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PIC16F18323-E/SLSQTP Datasheet(PDF) 118 Page - Microchip Technology |
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PIC16F18323-E/SLSQTP Datasheet(HTML) 118 Page - Microchip Technology |
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118 / 442 page  PIC16(L)F18313/18323 DS40001799A-page 118 Preliminary 2015 Microchip Technology Inc. EXAMPLE 10-4: WRITING TO PROGRAM FLASH MEMORY ; This write routine assumes the following: ; 1. 64 bytes of data are loaded, starting at the address in DATA_ADDR ; 2. Each word of data to be written is made up of two adjacent bytes in DATA_ADDR, ; stored in little endian format ; 3. A valid starting address (the least significant bits = 00000) is loaded in ADDRH:ADDRL ; 4. ADDRH and ADDRL are located in common RAM (locations 0x70 - 0x7F) ; 5. NVM interrupts are not taken into account BANKSEL NVMADRH MOVF ADDRH,W MOVWF NVMADRH ; Load initial address MOVF ADDRL,W MOVWF NVMADRL MOVLW LOW DATA_ADDR ; Load initial data address MOVWF FSR0L MOVLW HIGH DATA_ADDR MOVWF FSR0H BCF NVMCON1,NVMREGS ; Set Program Flash Memory as write location BSF NVMCON1,WREN ; Enable writes BSF NVMCON1,LWLO ; Load only write latches LOOP MOVIW FSR0++ MOVWF NVMDATL ; Load first data byte MOVIW FSR0++ MOVWF NVMDATH ; Load second data byte MOVF NVMADRL,W XORLW 0x1F ; Check if lower bits of address are 00000 ANDLW 0x1F ; and if on last of 32 addresses BTFSC STATUS,Z ; Last of 32 words? GOTO START_WRITE ; If so, go write latches into memory CALL UNLOCK_SEQ ; If not, go load latch INCF NVMADRL,F ; Increment address GOTO LOOP START_WRITE BCF NVMCON1,LWLO ; Latch writes complete, now write memory CALL UNLOCK_SEQ ; Perform required unlock sequence BCF NVMCON1,WREN ; Disable writes UNLOCK_SEQ MOVLW 55h BCF INTCON,GIE ; Disable interrupts MOVWF NVMCON2 ; Begin unlock sequence MOVLW AAh MOVWF NVMCON2 BSF NVMCON1,WR BSF INTCON,GIE ; Unlock sequence complete, re-enable interrupts return |
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