交流电压有效值测量程序：对交流电的周期采集40个点间隔500us。。。,AC voltage RMS measurement procedures

这是一个C8051F330运行于低频（L-F）模式的实例，该程序在运行一段时间后进入空闲状态(IDLE)，然后可以通过串口中断唤醒-This is a C8051F330 run on low-frequency (LF) model instance of the program running for some time into the idle state (IDLE), then wake up through the serial port interrupt