fet410_ta_40k.s43

MSP430常用的程序源代码,很全的,一定适合你(初学者)!

#include  "msp430x41x.h"
;******************************************************************************
;   MSP-FET430P410 Demo - Timer_A Output 40khz square wave, UpMode SMCLK DCO 
;
;   Description; Generate ~ 40.3khz square wave on P1.2 using Timer_A. Timer_A 
;   is configured to operate in the up-mode. CCR0 defines the period, CCR1 the 
;   duty cycle which is 50%.  CCR1 is output on P1.2. The 40khz square wave is 
;   generated in hardware and does not require any CPU resources.  
;   ACLK = LFXT1 = 32768, MCLK = SMCLK = TACLK = DCO = 32xACLK = 1.048576MHz 
;   //*An external watch crystal is required on XIN/XOUT for ACLK*//	  
;
;
;                MSP430F413
;             -----------------
;         /|\|              XIN|-  
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;            |             P1.2|--> ~ 40.3khz
;
;   M.Buccini
;   Texas Instruments, Inc
;   January 2002
;******************************************************************************
;------------------------------------------------------------------------------ 
            ORG     0E000h                  ; Program Start
;------------------------------------------------------------------------------ 
RESET       mov.w   #300h,SP                ; Initialize stackpointer
SetupWDT    mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupFLL    bis.b   #XCAP14PF,&FLL_CTL0     ; Configure load caps
SetupTA     mov.w   #TASSEL1+TACLR,&TACTL   ; SMCLK, Clear TAR
SetupC0     mov.w   #26-1,&CCR0             ; PWM Period 
SetupC1     mov.w   #OUTMOD2+OUTMOD1+OUTMOD0,&CCTL1 ; CCR1 Reset\Set
            mov.w   #13,&CCR1               ; CCR1 PWM Duty Cycle	  
SetupP1     bis.b   #004h,&P1DIR            ; P1.2 output
            bis.b   #004h,&P1SEL            ; P1.2/TA1 port function
            bis.w   #MC0,&TACTL             ; Start TA up Mode
                                            ;													  
Mainloop    bis.w   #CPUOFF,SR              ; CPU not required
            nop                             ; Required only for C-spy
                                            ;
;------------------------------------------------------------------------------ 
;           Interrupt Vectors Used MSP430F413         
;------------------------------------------------------------------------------ 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            END