PIC24FJ64GA104 FAMILY
EXAMPLE 5-4:
LOADING THE WRITE BUFFERS (C LANGUAGE CODE)
// C example using MPLAB C30
#define NUM_INSTRUCTION_PER_ROW 64
unsigned int offset;
unsigned int i;
unsigned long progAddr = 0xXXXXXX;
unsigned int progData[2*NUM_INSTRUCTION_PER_ROW];
// Address of row to write
// 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;
offset = progAddr & 0xFFFF;
// Initialize PM Page Boundary SFR
// 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++]);
__builtin_tblwth(offset, progData[i]);
offset = offset + 2;
// Write to address low word
// Write to upper byte
// Increment address
}
EXAMPLE 5-5:
INITIATING A PROGRAMMING SEQUENCE (ASSEMBLY LANGUAGE CODE)
DISI
#5
; Block all interrupts with priority <7
; for next 5 instructions
MOV
MOV
MOV
MOV
BSET
NOP
NOP
BTSC
BRA
#0x55, W0
W0, NVMKEY
#0xAA, W1
W1, NVMKEY
NVMCON, #WR
; Write the 55 key
;
; Write the AA key
; Start the erase sequence
;
;
NVMCON, #15
$-2
; and wait for it to be
; completed
EXAMPLE 5-6:
INITIATING A PROGRAMMING SEQUENCE (C LANGUAGE CODE)
// 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
DS39951C-page 56
2010 Microchip Technology Inc.
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