Datasheet

PIC24FJ256GB110 FAMILY
DS39897C-page 68  2009 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 #5 ; 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