msp430x20x3 flashwrite 01

; MSP430F20xx Demo - Flash In-System Programming, Copy SegC to SegD ; ; Description: This program first erases flash seg C, then it increments all ; values in seg C, then it erases seg C

; MSP430F20xx Demo - Flash In-System Programming, Copy SegC to SegD

;

; Description: This program first erases flash seg C, then it increments all

; values in seg C, then it erases seg C, then copies seg C to seg D

; Assumed MCLK 771kHz - 1428kHz

; //* Set Breakpoint in the Mainloop to avoid Stressing Flash *//

;

; MSP430F20xx

;

-; /|\| XIN|-; | | |

; |RST XOUT|-; | |

; #define value R4 ; ; M Buccini / L Westlund ; Texas Instruments Inc ; December 2005 ; Built with IAR Embedded Workbench Version: 3.40A ;******************************************************************************* #include <msp430x20x3.h>

ORG 0F800h ; Program Reset

; -RESET mov.w #0280h,SP ; Initialize stackpointer StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT CheckCal cmp.b #0FFh,&CALBC1_1MHZ ; Calibration constants erased? jeq Trap cmp.b #0FFh,&CALDCO_1MHZ jne Load Trap jmp $ ; Trap CPU!! Load mov.b &CALBC1_1MHZ,&BCSCTL1 ; Set DCO to 1MHz mov.b &CALDCO_1MHZ,&DCOCTL clr.b value ; value = value to write to flash ;

Mainloop call #Write_SegC ; Copy value to segment C inc.b value ;

call #CopyC2D ;

jmp Mainloop ; Repeat,SET BREAKPOINT HERE ;

; -Write_SegC ;Input = value, holds value to write to Seg C, R5 used as working reg

mov.w #01040h,R5 ;

Timing mov.w #FWKEY+FSSEL0+FN1,&FCTL2 ; *Timing generator = MCLK/3 Erase_SegC mov.w #FWKEY,&FCTL3 ; Lock = 0 mov.w #FWKEY+ERASE,&FCTL1 ; Erase bit = 1, allow interrupts mov.w #0,&01040h ; Dummy write to SegC to erase Prog_SegC mov.w #FWKEY+WRT,&FCTL1 ; Write bit = 1, block interrupts mov.w #FWKEY,&FCTL3 ; Lock = 0 Prog_L1 mov.b value,0(R5) ;

inc.w R5 ;

cmp.w #01080h,R5 ;

jne Prog_L1 ;

mov.w #FWKEY+LOCK,&FCTL3 ; Lock = 1; ret ;

;

; -CopyC2D ;Copy Seg C to Seg D, R5 used as working reg

mov.w #FWKEY+FSSEL0+FN1,&FCTL2 ; *Timing generator = MCLK/3

Erase_SegD mov.w #FWKEY,&FCTL3 ; Lock = 0

mov.w #FWKEY+ERASE,&FCTL1 ; Erase bit = 1

mov.w #0,&01000h ; Dummy write to SegD to erase

mov.w #01040h,R5 ; R5 = First byte in Seg C

Prog_SegD mov.w #FWKEY+WRT,&FCTL1 ; Write bit = 1, block interrupts mov.w #FWKEY,&FCTL3 ; Lock = 0

Prog_L2 mov.b @R5+,-65(R5) ; Copy Seg C to Seg D

cmp.w #01080h,R5 ;

jne Prog_L2 ;

mov.w #FWKEY+LOCK,&FCTL3 ; Lock = 1

ret

; -; Interrupt Vectors

ORG 0FFFEh ; MSP430 RESET Vector

DW RESET ;

END