第7章定时部件资料.ppt

3、定时器操作例子 （1）按照前面初始化定时器；设置TCNTBn=160(50+110)，TCMPBn=110；手动装入初值后，又重设TCNTBn=80， TCMPBn=40； （2）启动定时器,按第一个初值计数； （3）与第一个比较值相同，输出取反； （4）第一次计数结束，自动重装初值80、40； （5）在第一次中断处理程序又重设TCMPBn=60； （8）在第二次中断处理程序禁止自动重装初值，准备结束计数； （10）第三次计数结束，不再计数。 50 110 40 40 20 60 1 2 3 4 6 7 9 10 5 8 TOUTn 定时器应用举例 #define BIT_TIMER0 (0x110) int variable0,variable1,variable2,variable3,variable4; void __irq Timer0Done(void) { rSRCPND = BIT_TIMER0; //Clear pending bit rINTPND = BIT_TIMER0; //Clear serve bit variable0++; } void __irq Timer1Done(void) { rSRCPND = BIT_TIMER1; //Clear pending bit rINTPND = BIT_TIMER1; variable1++; } rINTPND; //Prevent an double interrupt pending #define pISR_TIMER0 (*(unsigned *)(_ISR_STARTADDRESS+0x48)) #define pISR_TIMER1 (*(unsigned *)(_ISR_STARTADDRESS+0x4c)) void Test_TimerInt(void) { variable0 = 0;variable1 = 0;variable2 = 0; variable3 = 0;variable4 = 0; rINTMSK = ~(BIT_TIMER4 | BIT_TIMER3 | BIT_TIMER2 | BIT_TIMER1 | BIT_TIMER0); //将各个中断向量写入中断向量表中 pISR_TIMER0 = (int)Timer0Done; pISR_TIMER1 = (int)Timer1Done; pISR_TIMER2 = (int)Timer2Done; pISR_TIMER3 = (int)Timer3Done; pISR_TIMER4 = (int)Timer4Done; Uart_Printf(\n[ Timer 0,1,2,3,4 Interrupt Test ]\n\n); rTCFG0 = rTCFG0 ~(0xffffff) | 0x000f0f; //死区宽度=0, //T1预分频=0x0f，T0预分频=0x0f rTCFG1 =rTCFG1 ~(0xffffff) | 0x001233; //全部使用中断 //T4---T0分频值为：1/2，1/4，1/8，1/16，1/16 //设置T0---T4计数初值 rTCNTB0 = 0xffff; // (1/(50MHz/16/16)) * 0xffff (65535) = 0.334s rTCNTB1 = 0xffff; // (1/(50MHz/16/16)) * 0xffff (65535) = 0.334s rTCNTB2 = 0xffff; // (1/(50MHz/16/8 )) * 0xffff (65535) = 0.163s rTCNTB3 = 0xffff; // (1/(50MHz/16/4 )) * 0xffff (65535) = 0.078s rTCNTB4 = 0xffff; // (1/(50MHz/16/2 )) * 0xffff (65535) = 0.039s rTCON =