fet140_ta02.s43

TI低功耗MCU用例子

#include  "msp430x14x.h"
;******************************************************************************
;   MSP-FET430P140 Demo - Timer_A Toggle P1.0, CCR0 upmode ISR, DCO SMCLK 
;
;   Description; Toggle P1.0 using using software and TA_0 ISR. Timer_A is 
;   configured in upmode, thus the timer will overflow when TAR counts to CCR0.  
;   In this example, CCR0 is loaded with 20000. 
;   ACLK = n/a, MCLK = SMCLK = TACLK = DCO ~ 800k
;
;                MSP430F149
;             -----------------
;         /|\|              XIN|-  
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;   M.Buccini
;   Texas Instruments, Inc
;   January 2002
;******************************************************************************
;------------------------------------------------------------------------------ 
            ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------ 
RESET       mov.w   #0A00h,SP               ; Initialize 'F149 stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupTA     mov.w   #TASSEL1+TACLR,&TACTL   ; SMCLK, clear TAR
SetupC0     mov.w   #CCIE,&CCTL0            ; CCR0 interrupt enabled
            mov.w   #20000,&CCR0            ; 
SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output 
            bis.w   #MC0,&TACTL             ; Start Timer_a in upmode
            eint                            ; Enable interrupts
                                            ;						  
Mainloop    bis.w   #CPUOFF,SR              ; CPU off
            nop                             ; Required for C-spy
                                            ;
;------------------------------------------------------------------------------ 
TA0_ISR;    Toggle P1.0
;------------------------------------------------------------------------------ 
            xor.b   #001h,&P1OUT            ; Toggle P1.0
            reti                            ;		 
                                            ;
;----------------------------------------------------------------------------- 
;           Interrupt Vectors Used MSP430x13x/14x         
;----------------------------------------------------------------------------- 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            ORG     0FFECh                  ; Timer_A0 Vector
            DW      TA0_ISR                 ; 
            END