Texas Instruments MSP430x1xx - Manual (Page 439)

Flash Memory Access via JTAG and Software
C-27
Flash Memory
The target flash memory module can not execute the programming code se-
quence while data is being written to it. In the following example, a subroutine
moves the programming-code sequence to another memory such as RAM.
Source Start Address of The Code Sequence >> R7
Destination Start Address of The Code Sequence >> R10
Move One Word: (R7) >> (R10)
Increment Source and Destination Pointer in R7 and R10
Start-of-Subroutine: Load_Flash_Routine
End-of-Subroutine: RET
End-of-Source Code ?
;------------------------------------------------------------
; Definitions used in Subroutine:
; Move programming code sequence into RAM (load_flash_routine)
;------------------------------------------------------------
Flash_ram .set 0222h ; Start address of flash
; program in the RAM
; program in the RAM
Prg_source_start .set 0xxxxh ; Start address of code
; in the flash to be prg’ed
Prg_source_end .set 0yyyyh ; End address of code
; in the flash to be prg’ed
Prg_dest_start .set Flash_ram
load_flash_routine ; The code of the program which moves
; Flash access code (write, erase,..)
; starts at label load_flash_routine
push r9
push r10
mov #Prg_source_start,R9 ; load pointer source
mov #Prg_dest_start,R10 ; load pointer destination
load_flash_prg
mov @R9,0(R10) ; move a word
incd R10 ; destination pointer + 2
incd R9 ; source pointer + 2
cmp # Prg_source_end,R9 ; compare to end_of_code
jne load_ flash_prg
pop r9
pop r10
ret