实验8_思考_bt_1.s43

MSP-TEST44X 学习板光盘资料及实验说明 本学习板是按照教育大纲

#include  "msp430x44x.h"
;******************************************************************************
;   MSP-Test44x Demo - Toggle P5.1 using ISR, DCO SMCLK 
;
;   Description; This program will toggle P5.1 by xor'ing P5.1 inside of
;   a basic timer ISR. Default DCO used to clock basic timer. 
;   ACLK = LFXT1 = 32768, MCLK = SMCLK = default DCO ~ 800k
;
;                MSP430F449
;             -----------------
;         /|\|              XIN|-  
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P5.1|-->LED
;

;------------------------------------------------------------------------------ 
            ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------ 
RESET       mov.w   #0A00h,SP               ; Initialize '449 stackpointer
Init_Sys    mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupBT     mov.b   #BTSSEL+BTIP2+BTIP1+BTIP0,&BTCTL   ; ~244us Int. 
            bis.b   #BTIE,&IE2              ; Enable Basic Timer interrupt        
SetupP5     bis.b   #002h,&P5DIR            ; P5.1 output
            eint                            ; Enable interrupts
                                            ;						  
Mainloop    bis.w   #CPUOFF,SR              ; CPU off
            nop                             ; Required for C-spy
                                            ;
;------------------------------------------------------------------------------
BT_ISR;     Toggle P5.1
;------------------------------------------------------------------------------
            xor.b   #002h,&P5OUT            ; Toggle P5.1
            reti                            ;		 
                                            ;   
;----------------------------------------------------------------------------- 
;           Interrupt Vectors Used MSP430F44x         
;----------------------------------------------------------------------------- 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            ORG     0FFE0h                  ; BT Vector
            DW      BT_ISR                  ; 
            END