[技术问答] ML51 可以使用BOD欠压检测代替ADC采集电源电压？

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/*                                                                                                         */

/* Copyright(c) 2019 Nuvoton Technology Corp. All rights reserved.                                         */

/*                                                                                                         */

/*---------------------------------------------------------------------------------------------------------*/



//***********************************************************************************************************

//  Website: http://www.nuvoton.com

//  E-Mail : MicroC-8bit@nuvoton.com

//***********************************************************************************************************



//***********************************************************************************************************

//  File Function: ML51 simple GPIO toggle out demo code

//***********************************************************************************************************



#include "ML51.h"

/**

 * [url=home.php?mod=space&uid=247401]@brief[/url]       ACMP interrupt subroutine

 * @param       None

 * [url=home.php?mod=space&uid=266161]@return[/url]      None

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     

 */





/**

 * @brief       ACMP negtive input use Bandgap voltage 

 * @param       None

 * @return      None

 * @details     

 */

void WKT_ISR(void) interrupt 17            // Vector [url=home.php?mod=space&uid=72445]@[/url]  0x8B

{

    clr_WKCON_WKTF;

        P14 = 0;

//      _delay_();

      P14 = 1;

//      _delay_();

          P14 = 0;

}



void ACMP_ISR (void) interrupt 23

{

  SFRS = 0x00;

  if ((ACMPSR&SET_BIT2)==SET_BIT2)

  {

    ACMPSR&=CLR_BIT2;

    P14 ^=1;

  }

  else if ((ACMPSR&SET_BIT0)==SET_BIT0)

  {

    ACMPSR&=CLR_BIT0;

    P14 ^=1;

  }  

}



void main (void) 

{



  unsigned char i;



/* Setting Multi function pin setting for GPIO toggle 

   * include gipo.c in Common for GPIO mode setting

*/

    MFP_P13_GPIO;

    P13_QUASI_MODE;

    MFP_P14_GPIO;

    P14_QUASI_MODE;





    for(i=0;i<0x05;i++)

    {

      P14 = 0;

      _delay_();

      P14 = 1;

      _delay_();

    }

    

    #if 1  

    MFP_P23_ACMP0_P1;    

    MFP_P24_ACMP0_N0;

    MFP_P41_ACMP0_O;    



///* ACMP VBG intial

///* Initial ACMP0 P2.3 as positive and Bandgap as negetive input, Output to P4.1 */

//    ACMP_Open(ACMP0, ACMP_CTL_POSSEL_P1, ACMP_CTL_NEGSEL_VBG,0, ACMP_CTL_ACMP0_OUTPUT_ENABLE, ACMP_CTL_HYSTERESIS_ENABLE);

///* Initial ACMP interrupt enable, wakeup function dis ble.*/

//    ACMP_INTEnable(ACMP0, ACMP_CTL_WAKEUP_ENABLE, ACMP_CTL_INT_ENABLE);

    

/* ACMP VREF intial 

   * include acmp.c in Library for ACMP initial and interrupt setting. */

//    VREF_Open(2);

/* Initial ACMP0 P2.3 as positive and Bandgap as negetive input, Output to P4.1 */

    ACMP_Open(ACMP0, ACMP_CTL_POSSEL_P1, ACMP_CTL_NEGSEL_CRV, ACMP_CTL_CRV_VREF, ACMP_CTL_ACMP0_OUTPUT_ENABLE, ACMP_CTL_HYSTERESIS_ENABLE);

/* CRV Value = CRV source voltage * (2+CRV1CTL)/12. so for this example = VREF/2.*/

    ACMP_CRVValue(ACMP0, 4);  

/* Initial ACMP interrupt enable, wakeup function disable.*/

    ACMP_INTEnable(ACMP0, ACMP_CTL_WAKEUP_ENABLE, ACMP_CTL_INT_ENABLE);

  

    WKT_Open(38400,256,100);

    WKT_Interrupt(Enable);

    

    ENABLE_GLOBAL_INTERRUPT;

    #endif 



//    BOD_Enable(VBOD24,BOD_RESET_ENABLE);

//    BOD_LowPower_Enable(LPBOD_MODE2,BOD_FT_ENABLE);

    LVR_Enable();

    BOD_Disable();

    POR_Disable();

//    LVR_Disable();

//    LowPowerLVR_Enable();

//    BIAS_ALL_DIGITAL();

    SFRS = 1;

    CKDIV = 0x0c;

/* Enable Low power run mode */ 

//  FsysSelect(FSYS_LIRC);

//  set_PCON_LPR;

  //set_PCON_IDLE;

  //set_PCON_PD;

    while(1)

    {    

    //      P14 = 0;

    //      P14 = 1;

      set_PCON_PD;

    }

      

}