测量电机转速，要求用定时计数器T1完成计数、T0完成定时，并假设电机转速小于 //

//65536转/分、在120ms内至少有1转（单片机晶体为6M，使用模式1将T1的 计数值放 /

//入fcy中 转速的脉冲输出接在T1脚上(即作为T1的外部工作时钟,将T1的初始值设为0//

//在一定时间内(120ms内T1的计数值不会翻转)读出T1中的值就能算出其转速) -Measuring motor speed, requires completion of timing T1 count counter, T0 completion time, and assuming the motor speed is less than//// 65536 r/min, in at least 120ms to 1 (single-chip crystal to 6M, the use of model 1 T1 value of the put///fcy in speed to the pulse output then feet in T1 (ie T1, as the work of the external clock, the initial value of T1 is set to 0//// in a certain period of time (120ms with T1 The total value will not be reversed) to read out the value of T1 will be able to calculate its speed)//