DVR datasheet(78/416 Pages) MICROCHIP

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PIC24FJ256GA705 FAMILY

DS30010118D-page 78

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EXAMPLE 6-3:

PROGRAMMING A DOUBLE WORD OF FLASH PROGRAM MEMORY

(‘C’ LANGUAGE CODE)

// C example using MPLAB XC16

unsigned

long progAddr = 0xXXXXXX;

// Address of word to program

unsigned

int

progData1L = 0xXXXX;

// Data to program lower word of word 1

unsigned

char progData1H = 0xXX;

// Data to program upper byte of word 1

unsigned

int

progData2L = 0xXXXX;

// Data to program lower word

of word 2

unsigned

char progData2H = 0xXX;

// Data to program upper byte of word 2

//Set up NVMCON for word programming

NVMCON = 0x4001;

// Initialize NVMCON

TBLPAG = 0xFA;

// Point TBLPAG to the write latches

//Set up pointer to the first memory location to be written

NVMADRU = progAddr>>16;

// Initialize PM Page Boundary SFR

NVMADR

= progAddr & 0xFFFF;

// Initialize lower word of address

//Perform TBLWT instructions to write latches

__builtin_tblwtl(0, progData1L);

// Write word 1 to address low word

__builtin_tblwth(0, progData1H);

// Write word 1 to upper byte

__builtin_tblwtl(1, progData2L);

// Write word 2 to address low word

__builtin_tblwth(1, progData2H);

// Write word 2 to upper byte

asm(“DISI #5”);

// Block interrupts with priority <7 for next 5

// instructions

__builtin_write_NVM();

// XC16 function to perform unlock sequence and set WR

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