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    • 140. 发明专利
    • Semiconductor integrated circuit
    • 半导体集成电路
    • JP2005115715A
    • 2005-04-28
    • JP2003350287
    • 2003-10-09
    • Renesas Technology Corp株式会社ルネサステクノロジ
    • OKUDA YUICHI
    • G06K19/077G06F1/08G06F13/42G06K17/00H03L7/07H03L7/091H03L7/23
    • H03L7/235G06F1/08H03L7/07H03L7/091
    • PROBLEM TO BE SOLVED: To self-oscillate at a required frequency by using a data string divided for every fixed cycle by a SOF (Start of Frame) packet or the like without using a vibrator. SOLUTION: A semiconductor integrated circuit has an external interface circuit, and the external interface circuit has a clock generation circuit (100) which inputs and outputs the data string divided for every fixed cycle and generates a synchronizing clock signal for use in synchronization of data input/output. The clock generation circuit has a self-oscillation circuit (120) being the oscillation source of the synchronizing clock signal and a control circuit (110) for finely adjusting the oscillation frequency of the self-oscillation circuit, and the control circuit detects delimitations of the fixed cycle in the data string and measures intervals of delimitations on the basis of the oscillation output of the self-oscillation circuit and controls the oscillation output of the self-oscillation circuit in such a direction that a measured value coincides with a target value. Thus self-oscillation at a required frequency is made possible by using a data string divided for every fixed cycle by the SOF packet or the like without using a vibrator. COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:通过使用通过SOF(起始帧)数据包等对每个固定周期分割的数据串而不使用振动器来以所需频率自振荡。 解决方案:半导体集成电路具有外部接口电路,并且外部接口电路具有时钟发生电路(100),其输入和输出每个固定周期划分的数据串,并产生用于同步的同步时钟信号 的数据输入/输出。 时钟发生电路具有作为同步时钟信号的振荡源的自身振荡电路(120)和用于微调自振荡电路的振荡频率的控制电路(110),并且控制电路检测到 固定循环,并根据自振荡电路的振荡输出测量间隔间隔,并以测量值与目标值一致的方向控制自振荡电路的振荡输出。 因此,通过使用通过SOF分组等对每个固定周期分割的数据串而不使用振动器,可以实现所需频率的自振荡。 版权所有(C)2005,JPO&NCIPI