| 摘要 |
PURPOSE:To simplify a peripheral circuit of a microprocessor by specifying a resistance value of plural sensors in time division so as to allow a digital data to be read to the microprocessor. CONSTITUTION:Ends of plural sensors S0-Sn are connected together, to which a potential equal to other terminals of each sensor is given sequentially, the microprocessor 10 give sequentially digital data A0-An to specify the resistance value of each sensor and the data are subject to digital/analog conversion 16. The analog signal is compared (13) with a potential appearing at the terminals connected together and the resistance value of each sensor is specified based on the result of comparison. Since a resistor 12 and the comparator 13 are used in common for the plural sensors S0-Sn in this way, the peripheral circuit of the microprocessor 10 is simplified. |
