PIC24F04KA201 datasheet(50/224 Pages) MICROCHIP

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PIC24F04KA201 FAMILY

DS39937B-page 48

Preliminary

EXAMPLE 5-3:

LOADING THE WRITE BUFFERS – ASSEMBLY LANGUAGE CODE

EXAMPLE 5-4:

LOADING THE WRITE BUFFERS – ‘C’ LANGUAGE CODE

; Set up NVMCON for row programming operations

MOV

#0x4004, W0

;

MOV

W0, NVMCON

; Initialize NVMCON

; Set up a pointer to the first program memory location to be written

; program memory selected, and writes enabled

MOV

#0x0000, W0

;

MOV

W0, TBLPAG

; Initialize PM Page Boundary SFR

MOV

#0x6000, W0

; An example program memory address

; Perform the TBLWT instructions to write the latches

; 0th_program_word

MOV

#LOW_WORD_0, W2

;

MOV

#HIGH_BYTE_0, W3

;

TBLWTL

W2, [W0]

; Write PM low word into program latch

TBLWTH

W3, [W0++]

; Write PM high byte into program latch

; 1st_program_word

MOV

#LOW_WORD_1, W2

;

MOV

#HIGH_BYTE_1, W3

;

TBLWTL

W2, [W0]

; Write PM low word into program latch

TBLWTH

W3, [W0++]

; Write PM high byte into program latch

;

2nd_program_word

MOV

#LOW_WORD_2, W2

;

MOV

#HIGH_BYTE_2, W3

;

TBLWTL

W2, [W0]

; Write PM low word into program latch

TBLWTH

W3, [W0++]

; Write PM high byte into program latch

•

; 32nd_program_word

MOV

#LOW_WORD_31, W2

;

MOV

#HIGH_BYTE_31, W3

;

TBLWTL

W2, [W0]

; Write PM low word into program latch

TBLWTH

W3, [W0]

; Write PM high byte into program latch

// C example using MPLAB C30

#define NUM_INSTRUCTION_PER_ROW 64

int __attribute__ ((space(auto_psv))) progAddr = &progAddr; // 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 = &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

}

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