Datasheet

PIC24F16KL402 FAMILY
DS30001037C-page 52  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 = &progAddr; // 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 = 0x4004; // Initialize NVMCON
//Set up pointer to the first memory location to be written
TBLPAG = __builtin_tblpage(&progAddr); // 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 #5 ; 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