Patent ID: 6704350
Filing Date: 2004-03-09
Classification: H04L

Abstract:
An AT-command analyzing device, comprising:a transmitting and receiving portion which receives asynchronous transmission serial data based on a baud-rate clock from a DTE; a control portion which analyzes the data received by said transmitting and receiving portion; a baud-rate generating portion which generates the baud-rate clock to be output to said transmitting and receiving portion in accordance with instructions from said control portion; a measuring portion which measures the span of the start bit of the first character of an AT command transmitted from said DTE based on instructions from said control portion; a rate analyzing portion which receives a measurement result of said measuring portion, 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 the rate of the start bit is more than a preset value; a sampling-clock generating portion which selects, in accordance with whether or not said flag has been set, the frequency-dividing data from either said rate analyzing portion or said control portion, and produces the sampling clock; and a shift-register portion which receives data subsequent to the start bit of the first character based on the sampling clock from said sampling-clock generating portion, and holds the received data, which data is then read by said control portion.