PIC24FJ256GA110_10 Datasheet, PDF (61/330 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit, General Purpose Flash Microcontrollers with Peripheral Pin Select

PIC24FJ256GA110 FAMILY
EXAMPLE 5-2: ERASING A PROGRAM MEMORY BLOCK (C LANGUAGE CODE)
// C example using MPLAB C30
unsigned long progAddr = 0xXXXXXX;
unsigned int offset;
// Address of row to write
//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
__builtin_tblwtl(offset, 0x0000);
// Set base address of erase block
// with dummy latch write
NVMCON = 0x4042;
// Initialize NVMCON
asm("DISI #5");
__builtin_write_NVM();
// Block all interrupts with priority <7
// for next 5 instructions
// C30 function to perform unlock
// sequence and set WR
EXAMPLE 5-3: LOADING THE WRITE BUFFERS (ASSEMBLY LANGUAGE CODE)
; Set up NVMCON for row programming operations
MOV
#0x4001, 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
•
•
•
; 63rd_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
 2010 Microchip Technology Inc.
DS39905E-page 61