msp430x54x_ucs_3.c

msp430单片机最新的产品MSP430F5438内部硬件通信模块的操作的示例程序

//******************************************************************************
//   MSP430F54x Demo - Software Toggle P1.0 with 12MHz DCO
//
//   Description: Toggle P1.0 by xor'ing P1.0 inside of a software loop.
//   ACLK is rought out on pin P11.0, SMCLK is brought out on P11.2, and MCLK
//   is brought out on pin P11.1.
//   ACLK = REFO = 32kHz, MCLK = SMCLK = 12MHz
//
//                 MSP430F5438
//             -----------------
//         /|\|                 |
//          | |            P11.0|-->ACLK
//          --|RST         P11.1|-->MCLK
//            |            P11.2|-->SMCLK
//            |                 |
//            |             P1.0|-->LED
//
//   Z Albus / W. Goh
//   Texas Instruments Inc.
//   September 2008
//   Built with CCE Version: 3.2.2 and IAR Embedded Workbench Version: 4.11B
//******************************************************************************
#include  "msp430x54x.h"

void main(void)
{
  volatile unsigned int i;

  WDTCTL = WDTPW+WDTHOLD;                   // Stop WDT
  P1DIR |= BIT0;                            // P1.0 output
  P11DIR |= 0x07;                           // ACLK, MCLK, SMCLK set out to pins
  P11SEL |= 0x07;                           // P11.0,1,2 for debugging purposes.

  UCSCTL0 = 0x00;                           // Set lowest possible DCOx, MODx
  UCSCTL1 = DCORSEL_6;                      // Select range for 12MHz operation
  UCSCTL2 = 374;                            // Set DCO Multiplier for 12MHz
                                            // (N + 1) * FLLRef = Fdco
                                            // (374 + 1) * 32768 = 12MHz
  UCSCTL3 = SELREF_2;                       // Set DCO FLL reference = REFO
  UCSCTL4 = SELS_3 + SELM_3;                // Set MCLK = SMCLK = DCOCLK

  while(1)
  {
    P1OUT ^= BIT0;
    for(i=50000;i>0;i--);                   // Delay
  }
}