在区域控制单元中，分别介绍了处理单元、输入信号检测、看门狗电路、通信扩展的设计。
Also many design methods are put forward when introducing of the area part, such as processing unit, input signal detection, watch dog circuit, extended communication and so on.
运算放大器扩展功能，在电子电路设计中其数学模型为放大电路，含移相电容、反馈电阻及输入阻抗。
In circuit design, the mathematical model of operational amplifier expanded function is expanded circuit. The circuit includes phase electric capacity, the feedback resistance and the input impedance.
硬件电路除一般单片机扩展电路外，还设计了输入电路和掉电保护电路。
For the hardware, not only all-purpose expanded circuits of the single-chip micro-processor but also input circuit and safe circuit for power failure have been designed.
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