| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately notify a host device that data are received in spite of the specification that mainly the host device inputs and outputs data. SOLUTION: A BS signal is switched over to an H level at a time t1, and a radio I/F detects a BS0 in accordance with the level change of the BS signal from the host device at a time t2 and the start of a BS0 period. The BS0 period is a period when packet communication is not performed. At a time t3, the BS signal is shifted to an INT (interrupt) transfer state. When an incoming call is detected at a time t4, it is registered in an INT register that the incoming call occurs and an interrupt request is also outputted to the host device. At a time t4, the interrupt request is outputted to the host device and an SDIO signal becomes an H level. Within the BS0 period, the interrupt request is outputted to the device 4 while notifying that the data are received.</p> |
