Serial data receiving circuit

• Main Author: YANBE HARUKI
• Format: Patent
• Language: English
• Published: 20.11.2008
• Subjects: CALCULATING; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION ANDCOMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION ANDCOMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWNENERGY USE; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

Object: Reduction of the power consumption except during the receiving operation by analyzing the control command inputted by asynchronous method according to the CPU instructions and identifying the communication rate and the character set. Solution: When a start instruction is received through a IF unit 23 from a CPU, a sequence control unit 22 supplies a master clock signal MCK as an internal clock signal ICK through a gate unit 11 . A start-bit measuring unit 12 measures the time length of the start-bit of a first-character in the serial input data SIN, and according to the measuring results thereof, a communication rate selecting unit 13 and a receiving clock generating unit 14 generates a receiving clock signal RCK. Corresponding to the control of the sequence control unit 22 , it is identified whether or not a specific command is received by receiving character strings by the first to the third character selecting units 15, 17 , and 19 . A character set selecting unit 21 selects a character set of asynchronous method based on the received character strings. When a halt instruction is received from the CPU or receiving is completed, the receiving clock signal RCK is halted by closing the gate unit 11.