与使用8位嵌入式微控制器有关的一种省钱的办法,就是采用阻容式振荡器。这种RC振荡器价格虽不高,但是产生的问题是温度稳定性和电压稳定性较低。在许多应用场合,RC振荡器的价格低廉是有吸引力的,但需要一个产生波特率,或为事件定时用的稳定的钟频发生电路。在这种情况下,便需要采用一种低频的、稳定的钟频信号源来校准波特率发生器或事件定时器。一种低频的、稳定的钟频信号源可来自电力线电压。这种电压是一种很好的50Hz或60Hz频率的 An economical way to use an 8-bit embedded microcontroller is to use a RC oscillator. The price of this RC oscillator is not high, but the problems that arise are lower temperature stability and lower voltage stability. The low cost of an RC oscillator is attractive in many applications, but requires a stable clock generation circuit that generates the baud rate or timing the event. In this case, you need to use a low-frequency, stable clock source to calibrate the baud rate generator or event timer. A low frequency, stable clock signal source can come from the power line voltage. This voltage is a good 50Hz or 60Hz frequency