AT-command analyzing device

Year	Description
2000	Invention patented by Tadanori Ryu, Yasuhiro Ishizaka, and Izumi Kinoshita on January 9th, 2000. Abstract: A first counter measures the span of the start bit of a first character of an AT command transmitted from a DTE based on instructions from an MPU. A decoder receives a measurement result of the first counter, outputs frequency-dividing data for producing a clock for sampling the first character, and also outputs, when the rate of the start bit is more than a preset value, a flag indicating this matter. A second counter selects, in accordance with whether or not the flag has been set, the frequency-dividing data from either the decoder or the MPU, and produces the sampling clock. A shift register receives data subsequent to the start bit of the first character based on the sampling clock from the second register, holds the received data, which data is then read by the MPU.
Source: selected by the editor from original sources.

Invention: AT-command analyzing device