fet430_wdt01.asm

application programme for fet430 in assembly language

;*******************************************************************************
;   MSP-FET430P430 Demo - WDT Toggle P5.1 Interval overflow ISR, DCO SMCLK
;
;   Description; Toggle P5.1 using software timed by the WDT ISR. Toggle rate
;   is approximately 31ms based on default ~ 1.048MHz DCO/SMCLK clock source
;   used in this example for the WDT.
;   ACLK = n/a, MCLK = SMCLK = default DCO ~ 1.048MHz
;
;                 MSP430FG439
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P5.1|-->LED
;
;   M.Buccini
;   Texas Instruments, Inc
;   September 2004
;   Built with CCE for MSP430 Version: 1.00
;*******************************************************************************
            .cdecls C,LIST,"msp430xG43x.h"  ; Include device header file

;-------------------------------------------------------------------------------
            .text                           ; Progam Start
;-------------------------------------------------------------------------------
RESET       mov.w   #0A00h,SP               ; Initialize stack pointer
SetupWDT    mov.w   #WDT_MDLY_32,&WDTCTL    ; WDT ~31ms interval timer
            bis.b   #WDTIE,&IE1             ; Enable WDT interrupt
SetupP5     bis.b   #002h,&P5DIR            ; P5.1 output
                                            ;
Mainloop    bis.w   #CPUOFF+GIE,SR          ; Enter LPM0, enable interrupts
            nop                             ; Required only for debugger
                                            ;
;-------------------------------------------------------------------------------
WDT_ISR;    Toggle P5.1
;-------------------------------------------------------------------------------
            xor.b   #002h,&P5OUT            ; Toggle P5.1
            reti                            ;
                                            ;
;-------------------------------------------------------------------------------
;           Interrupt Vectors Used MSP430x4xx
;-------------------------------------------------------------------------------
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .sect   ".int10"                ; WDT Vector
            .short  WDT_ISR                 ;

            .end