Microchip Technology MA240017 Data Sheet

 2008-2011 Microchip Technology Inc.

DS39927C-page 49

; 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

#0x1500, 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 = 0x1234

// 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 = __builtin_tbloffset(&progAddr);

// 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

   }