msp430x24x_wdt_06.s43

来自「步进电机驱动程序msp430f247单片机」· S43 代码 · 共 42 行

;*******************************************************************************
;   MSP430x24x Demo - WDT+ Failsafe Clock, 32kHz ACLK
;
;   Description; Allow WDT+ in watchdog to timeout sourced by ACLK. LPM3 is
;   entered, this example will demonstrate WDT+ feature by automatically
;   re-enabling WDT+ clock source as DCO if external XTAL fails. This can be
;   seen as a continued, though faster as clocked by DCO, watchdog timeout
;   which will toggle on P1.0 in main function.
;   ACLK = 32kHz, MCLK = SMCLK = default DCO ~1.045MHz
;
;                 MSP430F249
;              -----------------
;          /|\|              XIN|-
;           | |                 | 32kHz
;           --|RST          XOUT|-
;             |                 |
;             |             P1.0|-->LED
;
;   B. Nisarga
;   Texas Instruments Inc.
;   September 2007
;   Built with IAR Embedded Workbench Version: 3.42A
;*******************************************************************************
#include "msp430x24x.h"
;-------------------------------------------------------------------------------
            RSEG    CSTACK                  ; Define stack segment
;-------------------------------------------------------------------------------
            RSEG    CODE                    ; Assemble to Flash memory
;-------------------------------------------------------------------------------
RESET       mov.w   #SFE(CSTACK),SP         ; Initialize stackpointer
SetupWDT    mov.w   #WDT_ARST_1000,&WDTCTL  ; Set Watchdog Timer timeout 1s
            bis.b   #001h,&P1DIR            ; P1.0 output
            xor.b   #001h,&P1OUT            ; Toggle P1.0
Mainloop    bis.w   #LPM3+GIE,SR            ; Enter LPM3
            nop                             ;
;-------------------------------------------------------------------------------
            COMMON  INTVEC                  ; Interrupt Vectors
;-------------------------------------------------------------------------------
            ORG     RESET_VECTOR            ; MSP430 RESET Vector
            DW      RESET                   ;
            END