怎会没有呢？
以下就是F2××的例程，可能就是你想要的功能：

1. //******************************************************************************
   //  MSP430F21x2 Demo - ADC10, Sample A0, 1.5V, TA1 Trig, Set P1.0 if > 0.5V
   //
   //  Description: A0 is sampled 16/second (ACLK/2048) with reference to 1.5V.
   //  Timer_A is run in upmode and TA1 is used to automatically trigger
   //  ADC10 conversion, TA0 defines the period. Internal oscillator times sample
   //  (16x) and conversion (13x). Inside ADC10_ISR if A0 > 0.5Vcc, P1.0 is set,
   //  else reset. Normal mode is LPM3.
   //  //* An external watch crystal on XIN XOUT is required for ACLK *//
   //
   //               MSP430F21x2
   //            -----------------
   //        /||              XIN|-
   //         | |                 | 32kHz
   //         --|RST          XOUT|-
   //           |                 |
   //       >---|P2.0/A0     P1.0 |--> LED
   //
   //  A. Dannenberg
   //  Texas Instruments Inc.
   //  December 2007
   //  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
   //******************************************************************************
   #include "msp430x21x2.h"
   
   void main(void)
   {
     WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
     ADC10CTL1 = SHS_1 + CONSEQ_2;             // TA1 trigger sample start
     ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
     TACCR0 = 30;                              // Delay to allow Ref to settle
     TACCTL0 |= CCIE;                          // Compare-mode interrupt
     TACTL = TASSEL_2 + MC_1;                  // TACLK = SMCLK, Up mode
     __bis_SR_register(CPUOFF + GIE);          // LPM0, TA0_ISR will force exit
     TACCTL0 &= ~CCIE;                         // Disable timer Interrupt
     ADC10CTL0 |= ENC;                         // ADC10 Enable
     ADC10AE0 |= 0x01;                         // P2.0 ADC10 option select
     P1DIR |= 0x01;                            // Set P1.0 output
     TACCR0 = 2048-1;                          // PWM Period
     TACCTL1 = OUTMOD_3;                       // TACCR1 set/reset
     TACCR1 = 2047;                            // TACCR1 PWM Duty Cycle
     TACTL = TASSEL_1 + MC_1;                  // ACLK, up mode
   
     __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 w/ interrupts
   }
   
   // ADC10 interrupt service routine
   #pragma vector=ADC10_VECTOR
   __interrupt void ADC10_ISR(void)
   {
     if (ADC10MEM < 0x155)                     // ADC10MEM = A0 > 0.5V?
       P1OUT &= ~0x01;                         // Clear P1.0 LED off
     else
       P1OUT |= 0x01;                          // Set P1.0 LED on
   }
   
   #pragma vector=TIMER0_A0_VECTOR
   __interrupt void TA0_ISR(void)
   {
     TACTL = 0;                                // Clear Timer_A control registers
     __bic_SR_register_on_exit(CPUOFF);        // Clear CPUOFF bit from 0(SR)
   }
   

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