AT COMMAND RECEIVING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an AT command receiving circuit capable of measuring a communication speed, identifying the type of a parity and a data format to be used for communication and setting this identified information to a universal asynchronous reception/transmission(UART) circuit without requiring processing by a CPU at all. SOLUTION: A speed detecting part 12 and a character receiving part 14 judge the communication speed, the type of the parity and the data format from serial data containing respectively received AT commands and this information is written in a UART 2 by a communication speed/parity information setting part 16. Besides, a clock supply part 13 generates a clock for data reception and supplies it to the UART 2 on the basis of the communication speed detected by the speed detecting part 12.