实验6_tb_思考2.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 - Timer_B Toggle P5.1, TBCCR0 upmode ISR, DCO SMCLK 
;
;   Description; This program will toggle P5.1 using software and TB_0 ISR. 
;   Timer_B is configured in an upmode, thus the the timer will overflow when 
;   TBTAR counts to TBCCR0.  In this example, TBCCR0 is loaded with 40000. 
;   Default DCO setting used for TBCLK.
;   ACLK = n/a, MCLK = SMCLK = TBCLK = default DCO
;
;                MSP430F449
;             -----------------
;         /|\|              XIN|-  
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P5.1|-->LED
;
;  Yang Rui
;  Lierda, Inc
;  NOVEMBER 2003
;  Built with IAR Embedded Workbench Version: 1.26B
;------------------------------------------------------------------------------ 
            ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------ 
RESET       mov.w   #0A00h,SP               ; Initialize '449 stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupTB     mov.w   #TBSSEL1+TBCLR,&TBCTL   ; SMCLK, clear TAR
SetupC0     mov.w   #CCIE,&TBCCTL0          ; TBCCR0 interrupt enabled
            mov.w   #40000,&TBCCR0          ; 
SetupP5     bis.b   #002h,&P5DIR            ; P5.1 output 
            bis.w   #MC0,&TBCTL             ; Start Timer_a in upmode
            eint                            ; Enable interrupts
                                            ;						  
Mainloop    bis.w   #CPUOFF,SR              ; CPU off
            nop                             ; Required for C-spy
                                            ;
;------------------------------------------------------------------------------ 
TB0_ISR;    Toggle P5.1
;------------------------------------------------------------------------------ 
            xor.b   #002h,&P5OUT            ; Toggle P5.1
            reti                            ;		 
                                            ;
;------------------------------------------------------------------------------ 
;           Interrupt Vectors Used MSP430x44x         
;------------------------------------------------------------------------------ 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            ORG     0FFFAh                  ; Timer_B0 Vector
            DW      TB0_ISR                 ; 
            END