;******************************************************************************* ; MSP430G2x31 Demo - ADC10, Output Internal Vref on P1.4 & ADCCLK on P1.3 ; ; Description: Output ADC10 internal Vref on P1.4, toggling between two ; available options, 2.5V and 1.5V ADC10OSC also output on P1.3 ; ; MSP430G2x31 ; -; /|\| XIN|; | | | ; |RST XOUT|; | | ; | P1.3/ADC10CLK| > ADC10OSC ~ 3.5MHz - 6.5MHz ; | P1.4/A4| > Vref ; ; 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 SetupADC10 mov.w #CONSEQ_2,&ADC10CTL1 ; Repeat single channel mov.w #REFOUT+REFON+MSC+ADC10ON,&ADC10CTL0; ADC10 and VRef mov.w #30,&TACCR0 ; Delay to allow Ref to settle bis.w #CCIE,&TACCTL0 ; Compare-mode interrupt mov.w #TACLR+MC_1+TASSEL_2,&TACTL; up mode, SMCLK bis.w #LPM0+GIE,SR ; Enter LPM0, enable interrupts bic.w #CCIE,&TACCTL0 ; Disable timer interrupt dint ; Disable Interrupts bis.b #010h,&ADC10AE0 ; P1.4 = ADC10 option select bis.b #008h,&P1DIR ; P1.3 = output directon bis.b #008h,&P1SEL ; P1.3 = ADC10OSC option select ; Mainloop bic.w #ENC,&ADC10CTL0 ; ADC10 disable xor.w #REF2_5V,&ADC10CTL0 ; Toggle Vref 1.5/2.5V bis.w #ENC+ADC10SC,&ADC10CTL0 ; ADC10 enable, start conversion Delay mov.w #00Fh,R15 ; Long Delay mov.w #0,R14 ; Delay_1 dec.w R14 ; sbc.w R15 ; jnz Delay_1 ; jmp Mainloop ; ; ; TA0_ISR; ISR for TACCR0 ; clr.w &TACTL ; Clear Timer_A control registers bic.w #LPM0,0(SP) ; Exit LPM0 on reti reti ; ; -; Interrupt Vectors ; -.sect ".reset" ; MSP430 RESET Vector short RESET ; sect ".int09" ; Timer_A0 Vector short TA0_ISR ; end