Nuvoton M051 interrupt wake-up (sleep) demonstration program-EEWORLD

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Here is a demo program for the successfully tested Nuvoton M051 MCU interrupt wakeup (sleep):

#include "SmartM_M0.h"

#define __KEYISR EINT1_IRQHandler

#define DEBUGMSG printf

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

*Function name:KeyIntInit

* Input: None

*Output: None

*Function: key interrupt initialization

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

VOID KeyIntInit(VOID)

{

P3_MFP = (P3_MFP & (~P33_EINT1_MCLK)) | EINT1; //P3.2 pin is set as external interrupt

DBNCECON &= ~ICLK_ON;

DBNCECON &= DBCLK_HCLK;

DBNCECON |= SMP_256CK; //Set the anti-rebound sampling cycle selection

P3_DBEN |= DBEN3; //Enable P3.2 anti-rebound function

P3_IMD &= IMD3_EDG;

P3_IEN |= IF_EN3; //Set external interrupt 1 to falling edge trigger

NVIC_ISER |= EXT_INT1;

}

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

*Function name:McuSleepDeep

* Input: None

*Output: None

*Function: MCU enters sleep mode

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

VOID McuSleepDeep(VOID)

{

Delayms(20);

PROTECT_REG

(

/* Enter sleep mode */

SCR |= SLEEPDEEP;

/* Disable interrupt enable for wake-up in power-down mode*/

PWRCON &= ~PD_WU_IE;

PWRCON &= ~PD_WAIT_CPU;

PWRCON |= PWR_DOWN_EN;

)

Delayms(20);

}

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

*Function name: main

* Input: None

*Output: None

*Function: Function body

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

INT32 main(VOID)

{

PROTECT_REG //Protect FLASH memory during ISP download

(

PWRCON |= XTL12M_EN; //The default clock source is external crystal oscillator

while((CLKSTATUS & XTL12M_STB) == 0); //Wait for 12MHz clock to stabilize

CLKSEL0 = (CLKSEL0 & (~HCLK)) | HCLK_12M; //Set the external crystal oscillator as the system clock

P2_PMD = 0x5555;

)

KeyIntInit(); //Key interrupt initialization

while(1)

{

P2_DOUT = 0x00;

Delayms(500);

P2_DOUT = 0xFF;

Delayms(500);

McuSleepDeep(); //MCU enters sleep mode

}

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

*Function name:__KEYISR

* Input: None

*Output: None

*Function: key interrupt service function

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

VOID __KEYISR(VOID)

{

Delayms(100);

P3_ISRC = P3_ISRC; //Write 1 to clear

}

Reference address：Nuvoton M051 interrupt wake-up (sleep) demonstration program

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