| 摘要 |
A communication system between terminals is provided to suppress increase of a communication system price by performing an intercommunication between terminals having different perception voltages by using a diode and a boosting resistor. A communication system between terminals includes a high-voltage(5V) four-terminal(101), a diode(103), resistors(105,107), and a low-voltage(3.3V) three-terminal(109). The high-voltage four-terminal includes a terminal having a voltage of 5V and four terminals(for example, an output terminal, an input terminal, a clock terminal, and a chip selector). The high-voltage four-terminal performs an output communication by short-circuiting an output terminal(OUT) to an input/output terminal of the low-voltage three-terminal and the resistor so as to perform an intercommunication with the low-voltage three-terminal. The high-voltage four-terminal performs an input communication by connecting an input terminal(IN) to the diode and the resistor connected to a power(Vcc). The resistor supplies a current generated in the power at the time of the input communication with the high-voltage four-terminal and a current generated in the power at the time of the input communication with the low-voltage three-terminal.
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