| 摘要 |
PURPOSE:To respond to a various kinds of baud rates in an asynchronous transmission system flexibly, by providing a criterion value generating part which generates plural reference values to decide a break level. CONSTITUTION:A central processing unit 40 sends prescribed data and the write pulse of the data to the criterion value generating part 50c corresponding to the status of a data communication system. Then, the generating part 50c generates the plural reference values to decide the break level. And when a break time is measured, a reference break level time sent from the generating part 50c in advance is loaded on a counter part 50b. The counter past 50b detects a carrier at a time when reception data changes from a high level to a low level according to a loaded value, and outputs a break level pulse.
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