PIC24F32KA302 datasheet(62/364 Pages) MICROCHIP

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PIC24FV32KA304 FAMILY

DS39995D-page 62

 2011-2013 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

int __attribute__ ((space(auto_psv))) progAddr = 0x1234; // Global variable located in Pgm Memory

unsigned int offset;

unsigned int i;

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 = __builtin_tblpage(&progAddr);

// Initialize PM Page Boundary SFR

offset = __builtin_tbloffset(&progAddr);

// 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

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

; 2 NOPs required after setting WR

NOP

;

BTSC

NVMCON, #15

; Wait for the sequence to be completed

BRA

$-2

;

// C example using MPLAB C30

asm("DISI #5");

// Block all interrupts for next 5 instructions

__builtin_write_NVM();

// Perform unlock sequence and set WR

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