msp430dayii_dac12_01.c

430DAY精美手表DEMO程序和原理图

//*******************************************************************************
//  MSP-430-Day II Demo - DAC12.0 Output 1V 
//
//  Description; Using DAC12.0 and 2.5V ADC12REF reference with a gain of 1, 
//  output 1V on A8 (VERef+). Ouput accuracy is specified by that of the ADC12REF.
//  ACLK = 32768, MCLK = SMCLK = default DCO = 1048576, ADC12CLK = ADC12OSC
//  //*An external watch crystal on XIN XOUT is required for ACLK*//	  
//  //*MSP430FG439 Device Required*//
//
//                MSP430FG439
//            -----------------
//        /|\|              XIN|-  
//         | |                 | 32KHz
//         --|RST          XOUT|-
//           |                 |
//           |    DAC0 (VERef+)|--> 1V
//           |                 |
//
//  M.Buccini
//  Texas Instruments, Inc
//  February 2004
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  <msp430xG43x.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;                           // Stop watchdog timer
  FLL_CTL0 |= XCAP14PF;                               // Set load capacitance
  ADC12CTL0 = REF2_5V + REFON;                        // Internal 2.5V ref on 
  DAC12_0CTL = DAC12OPS + DAC12IR + DAC12AMP_5 + DAC12ENC;  // VERef+, Int ref gain 1
  DAC12_0DAT = 0x0666;                                // 1V

  _BIS_SR(LPM0_bits + GIE);                           // Enter LPM0 w/ interrupt 
}