先上代碼

volatile unsigned long g_timer0_delay_conut = 0;void main(void) {DISI(); //Disable all unmasked interruptsNy8b072a_Gpio_Init();//Ny8b072a_Timer1_Init();//Ny8b072a_Timer2_Init();Ny8b072a_Timer3_Init();ENI(); // Enable all unmasked interrupts while(1){//CLRWDT(); // Clear WatchDog/*LED1 = ~LED1;LED2 = ~LED2;LED3 = ~LED3;LED4 = ~LED4;*/App_Delay_Ms(1000);} }//10bit count down , max 0x3FF void Ny8b072a_Timer1_Init(void) {//1MSTMRH = 0x30; // TIMER1 higt 2bit in TMRH bit4~5 msb TMR1 = 0xE8; // Load 0xFF to TMR1 (Initial Timer1 register) low 8bitT1CR1 = C_TMR1_Reload | C_TMR1_En; // Enable Timer1, Initial value reloaded from TMR1, Non-stop mode T1CR2 = C_TMR1_ClkSrc_Inst | C_PS1_Div2; // Enable Prescaler1, Prescaler1 dividing rate = 1:2// Timer1 clock source is instruction clockINTE |= C_INT_TMR1; // Enable Timer1 overflow interrupt }//10bit count down , max 0x3FF void Ny8b072a_Timer2_Init(void) {//500usTMRH = 0x40; //TIMER2 higt 2bit in TMRH bit6~7 msb TMR2 = 0xF4; // Load 0xFF to TMR2 (Initial Timer2 register) low 8bitT2CR1 = C_TMR2_Reload | C_TMR2_En; // Enable Timer2, Initial value reloaded from TMR2, Non-stop mode T2CR2 = C_TMR2_ClkSrc_Inst | C_PS2_Div2; // Enable Prescaler2, Prescaler2 dividing rate = 1:2// Timer2 clock source is instruction clockINTE |= C_INT_TMR2; // Enable Timer2 overflow interrupt }//10bit count down , max 0x3FF void Ny8b072a_Timer3_Init(void) {//50usTM3RH = 0; //TIMER3 higt 2bit in TM3RH bit4~5 msb TMR3 = 50; // Load 0xFF to TMR3 (Initial Timer3 register) low 8bitT3CR1 = C_TMR3_Reload | C_TMR3_En; // Enable Timer3, Initial value reloaded from TMR3, Non-stop mode T3CR2 = C_TMR3_ClkSrc_Inst | C_PS3_Div2; // Enable Prescaler3, Prescaler3 dividing rate = 1:2// Timer3 clock source is instruction clock//這里用 |= 會報錯:如果其他中斷訊號剛好在此時產生的話，使用 'BSR' 指令清除中斷旗標有機會誤清其他的中斷旗標。 (201)INTE2 = C_INE_TMR3; // Enable Timer3 overflow interrupt }//! interrupt service routine void isr(void) __interrupt(0) { if(INTFbits.T1IF){g_timer0_delay_conut ++;if(500 == g_timer0_delay_conut ) //1MS * 500 = 500ms{LED1 ^= 1;g_timer0_delay_conut= 0;}INTF= (unsigned char)~(C_INT_TMR1); // Clear T1IF flag bit }if(INTFbits.T2IF){ g_timer0_delay_conut ++;if(1000 == g_timer0_delay_conut ) //500us * 1000 = 500ms{LED1 ^= 1;g_timer0_delay_conut = 0;}INTF= (unsigned char)~(C_INT_TMR2); // Clear T2IF flag bit }if(INTE2bits.T3IF){ g_timer0_delay_conut ++;if(10000 == g_timer0_delay_conut )//50us * 10000 = 500ms{LED1 ^= 1;g_timer0_delay_conut = 0;}INTE2= (unsigned char)~(C_INF_TMR3); // Clear T3IF flag bit } } 時鐘頻率指令周期定時器分頻TMRHTMR1中斷計數IO翻轉周期

8M	4T	C_PS1_Div2	0	50	10 000	500ms
8M	4T	C_PS1_Div4	0	50	10 000	1000ms

表中第一行，定時器1的時間計算如下：
8 000 000 / 4 / 2 = 1 000 000，1 / 1 000 000 = 1us；
定時器1的初值計數50需要50us，這就是定時器1每次進中斷的時間；
中斷里10000 == g_time0_delay_conut需要的時間為 50 * 10 000 = 500 000us = 500ms。

表中第二行，定時器1的分頻為4，驗證時間為2分頻的一倍，說明時間計算正確。

個人不建議把定時器初值設置過低(1us)，太頻繁的中斷容易引起意想不到的BUG，根據自己實際使用需求來設置一個合理的值。

總結

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