| 摘要 |
PURPOSE:To easily receive serial data even if a bit rate of the other party side is not known especially in a transmitting side and a receiving side by providing a clock generating part, a clock selecting part, a start bit detecting part, etc. CONSTITUTION:Plural clock groups obtained by bringing a reference clock to frequency division are always outputted from a clock generating part 1, and a clock selecting part 3 selects one clock in the clock group. On the other hand, a receiving bit inputted to a start bit detecting part 2 detects a prescribed start bit contained in receiving data, based on a clock outputted from the selecting part 3. While the detecting part 2 does not detect the start bit, the selecting part 3 selects successively from a higher clock or a lower clock in plural clocks, and when the start bit is detected, the output clock of the selecting part 3 is selected and fixed. In such a way, a data transfer part 4 transfers the receiving data by a clock of the time when the start bit is detected, therefore, even if each bit rate is not known in advance in the transmitting and receiving sides, the data can be transferred. |
