ELECTRONIC DEVICE, POWER SUPPLY VOLTAGE CONTROL METHOD OF ELECTRONIC DEVICE, SEMICONDUCTOR DEVICE, POWER SUPPLY VOLTAGE CONTROL METHOD OF SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an electronic device in which power consumption of an LSI can be reduced by lowering the power supply voltage of the I/O circuit of the LSI.

SOLUTION: A test signal generation unit 41A is provided in a first device 2A and transmits a test signal A to a test signal inspection unit 42B. The test signal inspection unit 42B is provided in a second device 2B and transmits a response signal A indicating whether or not the test signal A is received correctly to an I/O power supply control unit. The I/O power supply control unit generates a voltage decrease signal if a response signal A indicates that the test signal A is received correctly, otherwise generates a voltage increase signal. An I/O power supply unit supplies an I/O power supply having a voltage value decreased based on the voltage decrease signal, or an I/O power supply having a voltage value increased based on the voltage increase signal to a plurality of I/O circuits.

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