;******************************************************************************* ; MSP430G2xx1 Demo - Timer_A, PWM TA1-2, Up/Down Mode, 32kHz ACLK ; ; Description: This program generates one PWM output on P1.2 using ; Timer_A configured for up/down mode The value in CCR0, 128, defines ; the PWM period/2 and the value in CCR1 the PWM duty cycle ; Using 32kHz ACLK as TACLK, the timer period is 7.8ms with a 75% duty ; cycle on P1.2 Normal operating mode is LPM3 ; ACLK = TACLK = LFXT1 = 32768Hz, MCLK = default DCO ; //* External watch crystal on XIN XOUT is required for ACLK *// ; ; MSP430G2xx1 ; ; /|\| XIN|; | | | 32kHz ; |RST XOUT|; | | ; | P1.2/TA1| > CCR1 - 75% PWM ; ; D Dang ; Texas Instruments Inc ; October 2010 ; Built with Code Composer Essentials Version: 4.2.0 ;******************************************************************************* cdecls C,LIST, "msp430g2231.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 #128,&CCR0 ; PWM Period/2 SetupC1 mov.w #OUTMOD_6,&CCTL1 ; CCR1 toggle/set mov.w #32,&CCR1 ; CCR1 PWM Duty Cycle SetupTA mov.w #TASSEL_1+MC_3,&TACTL ; ACLK, updown mode ; Mainloop bis.w #LPM3,SR ; Enter LPM3 nop ; Required only for debugger ; ; -; Interrupt Vectors ; -.sect ".reset" ; MSP430 RESET Vector short RESET ; end