fet440_svs_01.c

来自「MSP430F43x,MSP430F44x系列单片机调试程序下载」· C语言 代码 · 共 40 行

//*******************************************************************************
//  MSP-FET430P440 Demo - SVS, POR @ 2.5V Vcc
//
//  Description: The SVS POR feature is used to disable normal operation that
//  toggles P5.1 by xor'ing P5.1 inside of a software loop.
//  In the example, when VCC is above 2.5V, the MSP430 toggles P5.1. When VCC is
//  below 2.5V, the SVS resets the MSP430, and no toggle is seen.
//  ACLK= n/a, MCLK = SMCLK = default DCO
//
//                MSP430F449
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P5.1|-->LED
//
//  M. Buccini / A. Dannenberg
//  Texas Instruments Inc.
//  May 2005
//  Built with Code Composer Essentials Version: 1.0
//******************************************************************************
#include <msp430x44x.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  P5DIR |= 0x02;                            // Set P5.1 to output direction
  SVSCTL = 0x60 + PORON;                    // SVS POR enabled @ 2.5V

  for (;;)
  {
    volatile unsigned int i;
    i = 50000;                              // Delay
    do (i--);
    while (i != 0);
    P5OUT ^= 0x02;                          // Toggle P5.1 using exclusive-OR
  }
}