积分脉冲频率调制 IPFM
脉冲分频器 pulse-frequency divider
结合积分脉冲频率调制 Integral Pulse Frequency Modulation ; IPFM
基于IS A总线的微秒级同步器采用可编程硬件定时，由晶振发出脉冲经分频后送入8254计数。
Programmable hardware timing was used in design of microsecond synchronizer based on ISA bus, after pulse generated by oscillator was divided frequency, it was sent to 8254 to count.
第一行的显示屏显示脉冲每分钟浓度除非分频器正在使用中。
The first line of the display shows pulses per minute unless a prescaler is in use.
计数器是最常用的时序电路之一，他们不只可以用来指望脉冲，还可以分频，定时，发生跳动的脉搏和其他的时钟信号等。
The counter is the most commonly used one of the sequential circuits, they not only can be used to count on pulse, still can separate frequency, timing, produce beats pulse and other clock signal etc.
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