64GA110 datasheet(62/330 Pages) MICROCHIP

62 / 330 page

PIC24FJ256GA110 FAMILY

DS39905E-page 62

 2010 Microchip Technology Inc.

EXAMPLE 5-4:

LOADING THE WRITE BUFFERS (C LANGUAGE CODE)

EXAMPLE 5-5:

INITIATING A PROGRAMMING SEQUENCE (ASSEMBLY LANGUAGE CODE)

EXAMPLE 5-6:

INITIATING A PROGRAMMING SEQUENCE (C LANGUAGE CODE)

// C example using MPLAB C30

#define NUM_INSTRUCTION_PER_ROW 64

unsigned int offset;

unsigned int i;

unsigned long progAddr = 0xXXXXXX;

// Address of row to write

unsigned int progData[2*NUM_INSTRUCTION_PER_ROW];

// Buffer of data to write

//Set up NVMCON for row programming

NVMCON = 0x4001;

// Initialize NVMCON

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

TBLPAG = progAddr>>16;

// Initialize PM Page Boundary SFR

offset = progAddr & 0xFFFF;

// Initialize lower word of address

//Perform TBLWT instructions to write necessary number of latches

for(i=0; i < 2*NUM_INSTRUCTION_PER_ROW; i++)

{

__builtin_tblwtl(offset, progData[i++]);

// Write to address low word

__builtin_tblwth(offset, progData[i]);

// Write to upper byte

offset = offset + 2;

// Increment address

}

DISI

; Block all interrupts with priority <7

; for next 5 instructions

MOV

#0x55, W0

MOV

W0, NVMKEY

; Write the 55 key

MOV

#0xAA, W1

;

MOV

W1, NVMKEY

; Write the AA key

BSET

NVMCON, #WR

; Start the erase sequence

NOP

;

NOP

;

BTSC

NVMCON, #15

; and wait for it to be

BRA

$-2

; completed

// C example using MPLAB C30

asm("DISI #5");

// Block all interrupts with priority < 7

// for next 5 instructions

__builtin_write_NVM();

// Perform unlock sequence and set WR

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