| 摘要 |
In a serial data transmission apparatus connected to a data transmission bus, an edge detector detects an edge in a signal at the data transmission bus. An edge interrupt operation is carried out to operate a timer in response to the edge. The edge interrupt operation is stopped when the timer is being operated. A timer interrupt operation carries out a fetching operation of a bit data on the data transmission bus in a receiving mode or a transmitting operation of a bit data to the data transmission bus in a transmitting mode, in response to the timer means whose content reaches a predetermined value.
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