PIC24FJ256DA210 Datasheet, PDF (85/408 Pages) Microchip Technology – 64/100-Pin, 16-Bit Flash Microcontrollers with Graphics Controller and USB On-The-Go (OTG)

PIC24FJ256DA210 FAMILY
EXAMPLE 5-2: ERASING A PROGRAM MEMORY BLOCK (‘C’ LANGUAGE CODE)
// C example using MPLAB C30
unsigned long progAddr = 0xXXXXXX;
// Address of row to write
unsigned int offset;
//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");
// Block all interrupts with priority <7
// for next 5 instructions
__builtin_write_NVM();
// check function to perform unlock
// sequence and set WR
EXAMPLE 5-3: LOADING THE WRITE BUFFERS
; 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_63, W2
;
MOV
#HIGH_BYTE_63, W3
;
TBLWTL W2, [W0]
; Write PM low word into program latch
TBLWTH W3, [W0]
; Write PM high byte into program latch
EXAMPLE 5-4: INITIATING A PROGRAMMING SEQUENCE
DISI #5
MOV.B
MOV
MOV.B
MOV
BSET
NOP
NOP
BTSC
BRA
#0x55, W0
W0, NVMKEY
#0xAA, W1
W1, NVMKEY
NVMCON, #WR
NVMCON, #15
$-2
; Block all interrupts with priority <7
; for next 5 instructions
; Write the 0x55 key
;
; Write the 0xAA key
; Start the programming sequence
; Required delays
; and wait for it to be
; completed
 2010 Microchip Technology Inc.
DS39969B-page 85