msp430x24x_clks.c

这是关于430单片机的一些应用示例程序

//******************************************************************************
//  MSP430x24x Demo - Basic Clock, Output Buffered SMCLK, ACLK, and MCLK
//
//  Description: Buffer ACLK on P5.6, SMCLK(DCO) on P5.5, and  MCLK on P5.4
//
//  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = CALxxx_8MHZ = 8MHz
//  //* External watch crystal on XIN XOUT is required for ACLK *//
//
//               MSP430F24x
//             -----------------
//         /|\|              XIN|-
//          | |                 | 32kHz
//          --|RST          XOUT|-
//            |                 |
//            |             P5.6|-->ACLK = 32kHz
//            |             P5.5|-->SMCLK = 8MHz
//            |             P5.4|-->MCLK = DCO
//
//  B. Nisarga
//  Texas Instruments Inc.
//  September 2007
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include "msp430x24x.h"

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop Watchdog Timer
  if (CALBC1_8MHZ ==0xFF || CALDCO_8MHZ == 0xFF)                                     
  {  
    while(1);                               // If calibration constants erased
                                            // do not load, trap CPU!!
  }  
  BCSCTL1 = CALBC1_8MHZ;                    // Set DCO to 8MHz
  DCOCTL = CALDCO_8MHZ;
  
  P5DIR |= 0x70;                            // P5.6,5,4 outputs
  P5SEL |= 0x70;                            // P5.6,5,4 options

  while(1)
  {
  }  
}