| 摘要 |
<p>A circuit for sensing a communication state equipped with a signal detecting circuit and a busy signal generating circuit for sensing different communication states accurately monitors the communication state of a communication network. The circuit includes a signal detecting section for detecting a start signal representing the initiation of data transmission and a stop signal informing of the finish of the data transmission from serial data and serial clock received via a bus, a busy signal generating section for determining a level of a busy signal according to levels of the start signal and stop signal of the signal detecting section, and a microprocessor for controlling the transmission/reception of the serial data and serial clock in accordance with the level of the busy signal of the busy signal generating section. Thus, when data is transmitted to other auxiliary device except the auxiliary devices under being communicated, the destroy of the communicating data is prevented.</p> |
