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SPIRIT1 データシート(PDF) 33 Page - STMicroelectronics |
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SPIRIT1 データシート(HTML) 33 Page - STMicroelectronics |
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33 / 94 page  SPIRIT1 Operating modes Doc ID 022758 Rev 3 33/94 MCU finishes sending out data to be transmitted, and would end when MCU expects that its transmission takes place, which would occur after a period of CCA. The choice of making CCA persistent should come from trading off transmission latency, under the direct control of the MCU, and power consumption, which would be greater due to a busy wait in reception mode. The overall CSMA/CA flowchart is shown in Figure 6, where Tcca and Tlisten are two of the parameters controlling the clear channel assessment procedure. Design practice recommends that these parameters average the channel energy over a certain period expressed as a multiple of the bit period (Tcca) and repeat such measurement several times covering longer periods (Tlisten). The measurement is performed directly by checking the carrier sense (CS) generated by the receiver module. |
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