msp430x54x_fll_1.c

来自「MSP430的开发程序的例子+中文注释」· C语言 代码 · 共 39 行

//******************************************************************************
//  msp430FG5438 Demo - FLL+, Runs Internal DCO at 2.45MHz
//
//  Description: This program demonstrates setting the internal DCO to run at
//  2.45MHz with auto-calibration by the FLL+ circuitry.
//  ACLK = REFO = 32768Hz, MCLK = SMCLK = DCO = (74+1) x ACLK = 2457600Hz	
//
//                 msp430FG5438
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//            |            P11.1|--> MCLK = 2.45MHz
//            |                 |
//            |            P11.0|--> ACLK = 32kHz
//            |                 |
//
//   M Smertneck
//   Texas Instruments Inc.
//   April 2008
//   Built with CCEv3.2 IAR Embedded Workbench Version: 3.42A
//******************************************************************************

#include <msp430x54x.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  UCSCTL1 = DCORSEL_4;                      // 2MHz nominal DCO
  UCSCTL2 = 74;                             // (74+1) x 32768 = 2.45Mhz

  P11DIR = BIT1+BIT0;                       // P11.0 & P11.1 to output direction
  P11SEL = BIT1+BIT0;                       // P11.0 & P11.1 to output MCLK & ACLK

  while(1);                                 // Loop in place
}