说明：  使用T1作为定时器（定时时间为50毫秒），T0作为计数器（计数由电机测速电路产生的脉冲个数，每转4个脉冲），每1秒时间后，读出T0的值（读出后须将T0清0），将该值（速度值*4）显示到LED数码显示器上
(The use of T1 as a timer (time of 50 ms from time to time), T0 as a counter (counting from the electrical pulse generated by gun circuit number, 4 pulse per revolution), 1 seconds each time, read out the value of T0 (time T0 after clearance should be 0), the value (speed value* 4) LED digital display shows the)