Nuvoton M051 Timer 2 Test Program-EEWORLD

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The following is the timer 2 test program of the M051 microcontroller.

#include "SmartM_M0.h"

bool flag = 0; //interrupt flag

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

*Function name: TMR2Init

* Input: None

*Output: None

*Function: Timer 2 initialization

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

VOID TMR2Init(VOID)

{

PROTECT_REG

(

/* Enable TMR2 clock source */

APBCLK |= TMR2_CLKEN;

/* Select TMR2 clock source as external crystal oscillator 12MHz */

CLKSEL1 = (CLKSEL1 & (~TM2_CLK)) | TM1_12M;

/* Reset TMR2 */

IPRSTC2 |= TMR2_RST;

IPRSTC2 &= ~TMR2_RST;

/* Select TMR2 working mode as periodic mode*/

TCSR2 &= ~TMR_MODE;

TCSR2 |= MODE_PERIOD;

/* Overflow period = (Period of timer clock input) * (8-bit Prescale + 1) * (24-bit TCMP)*/

/* Overflow period = (1/12MHz) * (0 + 1) * (12000*500)=500ms (0.5S)*/

TCSR2 = TCSR2 & 0xFFFFFF00; // Set the prescaler value [0~255]

TCMPR2 = 12000*500; // Set comparison value [0~16777215]

TCSR2 |= TMR_IE; //Enable TMR0 interrupt

NVIC_ISER |= TMR2_INT;

TCSR2 |= CRST; //Reset TMR0 counter

TCSR2 |= CEN; //Enable TMR0

)

}

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

*Function name: main

* Input: None

*Output: None

*Function: Function body

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

INT32 main(VOID)

{

u8 i =0;

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; //P2 port is set to output mode

P2_DOUT= 0x00; //P2 port outputs low level

)

TMR2Init();

while(1)

{

if(flag)

{

flag = 0;

i++;

}

if(i>7)

{

i = 0;

}

P2_DOUT = 1UL<

}

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

*Function name: TMR2_IRQHandler

* Input: None

*Output: None

*Function: Timer 2 interrupt service function

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

VOID TMR2_IRQHandler(VOID)

{

/* Clear TMR1 interrupt flag */

TISR2 |= TMR_TIF;

flag = 1;

}

Reference address：Nuvoton M051 Timer 2 Test Program

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