| 摘要 |
PROBLEM TO BE SOLVED: To provide a data input/output circuit in which receiving timing of input data can be set to an optimum value and an interface system provided with the circuit. SOLUTION: This circuit is a data input/output circuit for transmitting and receiving data synchronized with a clock differentially inputted with a reference voltage, and has registers 18, 19 in which setting data for setting changeably a level of a reference voltage are recorded, and level shift circuits 16, 17 setting a level of a reference voltage to the prescribed value conforming to the setting data recorded in the registers 18, 19. And a phase of an internal clock being differential output is adjusted by the reference voltage, and data can be received surely.
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