?? msp430x20x3_wdt_05.s43
字號(hào):
;*******************************************************************************
; MSP430F20xx Demo - Reset on Invalid Address fetch, Toggle P1.0
;
; Description: Toggle P1.0 by xor'ing P1.0 inside of a software loop that
; ends with TAR loaded with 3FFFh - op-code for "jmp $" This simulates a code
; error. The MSP430F2xx will force a reset because it will not allow a fetch
; from within the address range of the peripheral memory, as is seen by
; return to the mainloop and LED flash.
; In contrast, an MSP430F1xx device will "jmp $" stopping code execution with
; no LED flash.
; ACLK = n/a, MCLK = SMCLK = default DCO
;
; MSP430F20xx
; -----------------
; /|\| XIN|-
; | | |
; --|RST XOUT|-
; | |
; | P1.0|-->LED
;
; M. Buccini / L. Westlund
; Texas Instruments, Inc
; October 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
SetupP1 bis.b #001h,&P1DIR ; P1.0 output
mov.w #03FFFh,&TAR ; "jmp $"
;
Mainloop xor.b #001h,&P1OUT ; Toggle P1.0
Wait mov.w #050000,R15 ; Delay to R15
L1 dec.w R15 ; Decrement R15
jnz L1 ; Delay over?
mov #0170h,PC ; Invalid fetch
jmp Mainloop ; Again
;
;-------------------------------------------------------------------------------
; Interrupt Vectors Used MSP430
;-------------------------------------------------------------------------------
ORG 0FFFEh ; MSP430 RESET Vector
DW RESET ;
END
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