msp430x20x3_ta_16.asm

来自「MSP430F20xx Assembler Examples Code,Comp」· 汇编 代码 · 共 47 行

;*******************************************************************************
;   MSP430F20xx Demo - Timer_A, PWM TA1, Up Mode, DCO SMCLK
;
;   Description: This program generates one PWM output on P1.2 using
;   Timer_A configured for up mode. The value in CCR0, 512-1, defines the PWM
;   period and the value in CCR1 the PWM duty cycles.
;   A 75% duty cycle is on P1.2.
;   ACLK = n/a, SMCLK = MCLK = TACLK = default DCO
;
;                MSP430F20xx
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |         P1.2/TA1|--> CCR1 - 75% PWM
;
;   P.Thanigai
;   Texas Instruments Inc.
;   May 2007
;   Built with Code Composer Essentials Version: 2.0
;*******************************************************************************
 .cdecls C,LIST,  "msp430x20x3.h"

;------------------------------------------------------------------------------
            .text                           ; Progam Start
;------------------------------------------------------------------------------
RESET       mov.w   #0280h,SP               ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP1     bis.b   #00Ch,&P1DIR            ; P1.2 and P1.3 output
            bis.b   #00Ch,&P1SEL            ; P1.2 and P1.3 TA1/2 otions
SetupC0     mov.w   #512-1,&CCR0            ; PWM Period
SetupC1     mov.w   #OUTMOD_7,&CCTL1        ; CCR1 reset/set
            mov.w   #384,&CCR1              ; CCR1 PWM Duty Cycle	
SetupTA     mov.w   #TASSEL_2+MC_1,&TACTL   ; SMCLK, upmode
                                            ;					
Mainloop    bis.w   #CPUOFF,SR              ; CPU off
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .end