PIC24F04KA201 datasheet(51/224 Pages) MICROCHIP

51 / 224 page

Preliminary

DS39937B-page 49

PIC24F04KA201 FAMILY

EXAMPLE 5-5:

INITIATING A PROGRAMMING SEQUENCE – ASSEMBLY LANGUAGE CODE

EXAMPLE 5-6:

INITIATING A PROGRAMMING SEQUENCE – ‘C’ LANGUAGE CODE

EXAMPLE 5-7:

PROGRAMMING A SINGLE WORD OF FLASH PROGRAM MEMORY

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

; Setup a pointer to data Program Memory

MOV

#tblpage(PROG_ADDR), W0

;

MOV

W0, TBLPAG

;Initialize PM Page Boundary SFR

MOV

#tbloffset(PROG_ADDR), W0

;Initialize a register with program memory address

MOV

#LOW_WORD_N, W2

;

MOV

#HIGH_BYTE_N, W3

;

TBLWTL

W2, [W0]

; Write PM low word into program latch

TBLWTH

W3, [W0++]

; Write PM high byte into program latch

; Setup NVMCON for programming one word to data Program Memory

MOV

#0x4003, W0

;

MOV

W0, NVMCON

; Set NVMOP bits to 0011

DISI

; Disable interrupts while the KEY sequence is written

MOV

#0x55, W0

; Write the key sequence

MOV

W0, NVMKEY

MOV

#0xAA, W0

MOV

W0, NVMKEY

BSET

NVMCON, #WR

; Start the write cycle

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