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msp430G2553时钟选择与分频程序

2019.06.08 来源: 浏览:29次

msp430G2553时钟选择与分频程序

msp430G2553单片机的时钟选择和分频程序如下:

#include "msp430G2553

msp430G2553时钟选择与分频程序

.h"

#define unchar unsigned char

#define uint unsigned int

uint Fre;

int main( void )

{

// Stop watchdog timer to prevent time out reset

WDTCTL = WDTPW + WDTHOLD;

BCSCTL2 |=SELM_1+DIVM_0;

P1DIR &=~BIT3;

P1REN |=BIT3;

P1OUT |=BIT3;

P1DIR |=BIT0;

P1IE |=BIT3;

P1IES &=~BIT3;

_EINT();

while(1)

{

P1OUT ^=BIT0;

__delay_cycles();

}

}

#pragma vector=PORT1_VECTOR

__interrupt void PORTP13(void)

{

uint temp,pushkey=0;

pushkey=BIT3 & (~P1DIR);

__delay_cycles(100000);

temp=P1IN;

if((~temp) & BIT3==pushkey)

{

Fre++;

if(Fre>3) Fre=0;

switch(Fre)

{

case 0: DCOCTL=CALDCO_1MHZ;BCSCTL1 = CALBC1_1MHZ;break;

case 1: DCOCTL=CALDCO_8MHZ;BCSCTL1 = CALBC1_8MHZ;break;

case 2: DCOCTL=CALDCO_12MHZ;BCSCTL1 = CALBC1_12MHZ;break;

case 3: DCOCTL=CALDCO_16MHZ;BCSCTL1 = CALBC1_16MHZ;break;

default:break;

}

}

P1IFG &=~BIT3;

}

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