• 状态
  • 已锁定 已锁定
  • 回复 2 回复
  • 订户 16 订户
  • 视图 806 视图
  • 用户 0 会员在此处
选项
选项
相关

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

msp430f413急求助

shijin chen
Intellectual 330 points

程序功能：４１３一个管脚输入脉冲，对该脉冲数进行记数，断电的时候，把脉冲数写入flash．本人想利用比较器，对供电电压进行检测，当电压低于参考电压，进入比较中断，把脉冲数保存．我现在在对比较器设置的时候不知道如何对比较器的寄存器进行设置，不知道如何选择参考电压．

  • 0
    TI__Intellectual 945 points

    请看MSP430x4xx Family user's Guide的23-1及后面内容。

  • 0
    TI__Intellectual 1395 points

    在TI的CCSv5 IDE中有比较器的使用例程。请参考如下的例程：

    //******************************************************************************
    //   MSP430x41x2 Demo - Comparator A, Poll input CA0, CA exchange, result P5.1
    //
    //   Description: The Voltage at pin CA0 (Vcompare) is compared with reference
    //   voltage of 0.5*Vcc. LED is toggled when Vcompare crosses the ref voltage.
    //
    //
    //              MSP430x41x2
    //             -----------------
    //         /|\|                 |
    //          | |                 |
    //          --|RST           CA0|<--Vcompare
    //            |                 |
    //            |                 |
    //            |             P5.1|-->LED
    //
    //  P. Thanigai
    //  Texas Instruments Inc.
    //  January 2009
    //  Built with CCE Version: 3.1 and IAR Embedded Workbench Version: 4.11
    //******************************************************************************
    #include  <msp430x41x2.h>

    void main(void)
    {
      WDTCTL = WDTPW+WDTHOLD;                   // Stop WDT
      FLL_CTL0 |= XCAP14PF;                     // Configure load caps

      CACTL1 = CAEX+CAON+CAREF_2+CARSEL;        // Enable comp,
      CACTL2 = P2CA0;                           // Pin to CA0
      CAPD |= CAPD6;                            // Port pin buffer disable
      P5DIR |= 0x02;                            // Set P5.1 to output direction
      P1DIR |= 0x20;                            // P1.5 = CAOUT
      P1SEL |= 0x20;                            // P1.5 = CAOUT

      while(1)
      {
        if (CACTL2&0x01)
          P5OUT |= 0x02;                        // Set LED if result =1
        else
          P5OUT &= ~0x02;                       // Clear LED if result =0

      }
    }