TMR0定時(shí)實(shí)驗(yàn)

時(shí)間：2018-07-06 12:40:01

關(guān)鍵字： tmr0 定時(shí)實(shí)驗(yàn)

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[導(dǎo)讀]#include #define uchar unsigned char#define uint unsigned int__CONFIG(0X3B32);#define LED PORTDchar Counter = 0; // 1S計(jì)數(shù)變量清零/********定時(shí)器0初始化函數(shù)********/void timer0_init(){ OPTION_R

#include #define uchar unsigned char#define uint unsigned int__CONFIG(0X3B32);#define LED PORTDchar Counter = 0; // 1S計(jì)數(shù)變量清零/********定時(shí)器0初始化函數(shù)********/void timer0_init(){ OPTION_REG=0b00000111; //TMR0對內(nèi)部時(shí)鐘計(jì)數(shù)，預(yù)分頻器給TMR0，分頻比為1:256INTCON=0b10100000; //允許TMR0溢出中斷TMR0=61; //TMR0賦初值，定時(shí)10ms}/********主函數(shù)********/void main(void){TRISD=0x00; //設(shè)PORTD為輸出timer0_init();LED=0x00; while(1); //原地等待}/********中斷服務(wù)程序********/void interrupt ISR(void){ if (T0IF==1){T0IF=0; //清TMR0溢出中斷標(biāo)志位TMR0=61; //TMR0賦初值，必須！if(++Counter >= 100) //定時(shí)時(shí)間到1S嗎?定時(shí)中斷溢出100次為1S{LED=~LED;Counter = 0; //1S計(jì)時(shí)變量清零}}}