msp430x42x0_wdt_02.s43

来自「该文件包含TI公司MSP430X42X0系列单片机的示例代码。」· S43 代码 · 共 49 行

;******************************************************************************
;   MSP430x42x0 Demo - WDT, Toggle P1.0, Interval Overflow ISR, 32kHz ACLK
;
;   Description: Toggle P1.0 using WDT configured for Interval Timer mode.
;   Interrupt toggles LED every 250ms based on 32kHz ACLK WDT clock source.
;   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
SetupFLL    bis.b   #XCAP14PF,&FLL_CTL0     ; Configure load caps
SetupWDT    mov.w   #WDT_ADLY_250,&WDTCTL   ; WDT 250ms, ACLK, interval timer
            bis.b   #WDTIE,&IE1             ; Enable WDT interrupt
SetupP5     bis.b   #001h,&P1DIR            ; P1.0 output
                                            ;					
Mainloop    bis.w   #LPM3+GIE,SR            ; Enter LPM3, enable interrupts
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
WDT_ISR;    Toggle P5.1
;------------------------------------------------------------------------------
            xor.b   #001h,&P1OUT            ; Toggle P1.0
            reti                            ;		
                                            ;
;-----------------------------------------------------------------------------
;           Interrupt Vectors Used MSP430x44x
;-----------------------------------------------------------------------------
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ;
            ORG     0FFF4h                  ; WDT Vector
            DW      WDT_ISR                 ;
            END