US 7,321,615 B2 | ||
At-command analyzing method | ||
Tadanori Ryu, Kanagawa (Japan); Yasuhiro Ishizaka, Osaka (Japan); and Izumi Kinoshita, Hyogo (Japan) | ||
Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
Filed on Dec. 08, 2003, as Appl. No. 10/728,959. | ||
Application 10/728959 is a continuation of application No. 09/479889, filed on Jan. 10, 2000, granted, now 6,704,350. | ||
Claims priority of application No. 11-006119 (JP), filed on Jan. 13, 1999. | ||
Prior Publication US 2004/0114679 A1, Jun. 17, 2004 | ||
This patent is subject to a terminal disclaimer. | ||
Int. Cl. H04B 1/38 (2006.01) |
U.S. Cl. 375—222 [375/222; 375/225] | 9 Claims |
1. A method of analyzing an AT-command comprising:
receiving asynchronous transmission serial data in a transmitting portion based on a baud-rate clock from a DTE;
analyzing the data received with a controller;
generating the baud-rate clock to be output to the transmitting and receiving portion in accordance with instructions from
the controller;
measuring a span of a start bit of a first character of an AT command transmitted from the DTE based on instructions from
the controller to produce a measurement result;
analyzing the measurement result in a rate-analyzing portion;
outputting frequency-dividing data;
producing a sampling clock in a sampling-clock-generating portion based on the frequency-dividing data and outputting, when
the rate of the start bit is more than a preset value, a flag indicating that the rate of the start bit is more than a preset
value;
selecting, in accordance with whether or not the flag has been set, the frequency-dividing data from either the rate analyzing
portion or the controller;
receiving data subsequent to the start bit of the first character based on the sampling clock;
holding the received data; and
reading the received data with the controller.
|