msp430x42x0_wdt_01.s43

MSP430F42x0.zip c语言 例程打包

;******************************************************************************
;   MSP430x42x0 Demo - WDT, Toggle P1.0, Interval Overflow ISR, DCO SMCLK
;
;   Description: Toggle P1.0 using WDT configured for Interval Timer mode.
;   Interrupt toggles LED every 31ms when using default FLL+ register
;   settings and an external 32kHz watch crystal.
;   ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
;   //* An external watch crystal between XIN & XOUT is required for ACLK *//	
;
;                 MSP430F4270
;             -----------------
;         /|\|              XIN|-
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;  L. Westlund / S. Karthikeyan
;  Texas Instruments Inc.
;  June 2005
;  Built with IAR Embedded Workbench Version: 3.30A
;******************************************************************************
#include  <msp430x42x0.h>
;------------------------------------------------------------------------------
            ORG     08000h                  ; Program Start
;------------------------------------------------------------------------------
RESET       mov.w   #300h,SP                ; Initialize stackpointer
SetupWDT    mov.w   #WDT_MDLY_32,&WDTCTL    ; WDT ~32ms interval timer
            bis.b   #WDTIE,&IE1             ; Enable WDT interrupt
SetupP5     bis.b   #001h,&P1DIR            ; P1.0 output
                                            ;						
Mainloop    bis.w   #CPUOFF+GIE,SR          ; Enter LPM0, enable interrupts
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
WDT_ISR;    Toggle P5.1
;------------------------------------------------------------------------------
            xor.b   #001h,&P1OUT            ; Toggle P1.0
            reti                            ;		
                                            ;
;-----------------------------------------------------------------------------
;           Interrupt Vectors
;-----------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            ORG     0FFF4h                  ; WDT Vector
            DW      WDT_ISR                 ;
            END