msp430x54x_1_8mhz.c

MSP430F5XXX的sample code

//******************************************************************************
//   MSP430x54x Demo - Software Toggle P1.0
//
//   Description: Toggle P1.0 by xor'ing P1.0 inside of a software loop.
//   ACLK = REFO = 32kHz, MCLK = SMCLK = 8MHz
//
//                 MSP430x5438
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//            |             P1.0|-->LED
//
//   Z Albus
//   Texas Instruments Inc.
//   May 2008
//   Built with CCEv3.2 CCE Version: 3.2.0
//******************************************************************************
#include  "msp430x54x.h"

void main(void)
{
  volatile unsigned int i;

  WDTCTL = WDTPW+WDTHOLD;                   // Stop WDT
  P1DIR |= BIT0;                            // P1.0 output
  
  UCSCTL0 = 0x00;                           // Set lowest possible DCOx, MODx
  //UCSCTL3 = SELREF_2;                       // Set DCO FLL reference = REFO
  UCSCTL1 = DCORSEL_6;                      // Select range for 12MHz operation 
  UCSCTL2 = 249;                            // Set DCO Multiplier for 8MHz
  UCSCTL4 = 0;
  UCSCTL4 = SELM_3;                // Set MCLK = DCOCLK
  
  while(1)
  {
    P1OUT ^= BIT0;
    for(i=60000;i>0;i--);                   // Delay  
  }
}