RTC CHECKING METHOD FOR MULTI FAX COMMUNITCATION

摘要

The method carries out an RTC check by detecting RTC from among the signals of a MODEM. The method includes the steps of: checking an RTC checking flag; receiving data by using DMA to carry out RTC-checking; checking the existence or absence of a FED signal after the set-up of the RTC flag; checking the existence or absence of a CDET signal upon detecting an FED signal; and setting the MODEM to a receiving mode upon detecting the CDET signal, and returning the operation upon detecting none of CDET signal or non-setting of the flag.