DSPIC30F MICROCHIP [Microchip Technology], DSPIC30F Datasheet - Page 68

• Manufacturer Part Number: DSPIC30F
• Description: General Purpose and Sensor Families High-Performance Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

dsPIC30F
6.6.3
Example 6-2 shows a sequence of instructions that can
be used to load the 96 bytes of write latches. Four
TBLWTL and four TBLWTH instructions are needed to
load the write latches selected by the table pointer.
EXAMPLE 6-2:
6.6.4
For protection, the write initiate sequence for NVMKEY
must be used to allow any erase or program operation
to proceed. After the programming command has been
executed, the user must wait for the programming time
until programming is complete. The two instructions fol-
lowing the start of the programming sequence should
be NOPs.
EXAMPLE 6-3:
DS70083G-page 66
; Set up a pointer to the first program memory location to be written
; program memory selected, and writes enabled
; Perform the TBLWT instructions to write the latches
; 0th_program_word
; 1st_program_word
;
; 31st_program_word
Note: In Example 6-2, the contents of the upper byte of W3 has no effect.
2nd_program_word
DISI
MOV
MOV
MOV
MOV
BSET
NOP
NOP
MOV
MOV
MOV
MOV
MOV
TBLWTL W2
TBLWTH W3
MOV
MOV
TBLWTL W2
TBLWTH W3
MOV
MOV
TBLWTL W2
TBLWTH W3
•
•
•
MOV
MOV
TBLWTL W2
TBLWTH W3
LOADING WRITE LATCHES
INITIATING THE PROGRAMMING
SEQUENCE
#5
#0x55,W0
W0
#0xAA,W1
W1
NVMCON,#WR
#0x0000,W0
W0
#0x6000,W0
#LOW_WORD_0,W2
#HIGH_BYTE_0,W3
#LOW_WORD_1,W2
#HIGH_BYTE_1,W3
#LOW_WORD_2,W2
#HIGH_BYTE_2,W3
#LOW_WORD_3,W2
#HIGH_BYTE_3,W3
,
,
LOADING WRITE LATCHES
,
,
,
,
,
,
,
,
,
INITIATING A PROGRAMMING SEQUENCE
NVMKEY
NVMKEY
TBLPAG
[W0]
[W0++]
[W0]
[W0++]
[W0]
[W0++]
[W0]
[W0++]
Preliminary
; Block all interrupts with priority <7 for
; next 5 instructions
;
; Write the 0x55 key
;
; Write the 0xAA key
; Start the erase sequence
; Insert two NOPs after the erase
; command is asserted
;
; Initialize PM Page Boundary SFR
; An example program memory address
;
;
; Write PM low word into program latch
; Write PM high byte into program latch
;
;
; Write PM low word into program latch
; Write PM high byte into program latch
;
;
; Write PM low word into program latch
; Write PM high byte into program latch
;
;
; Write PM low word into program latch
; Write PM high byte into program latch
 2004 Microchip Technology Inc.