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    • 7. 发明授权
    • Multi-frequency clock generation with low state coincidence upon latching
    • 闭锁时低状态重合的多频时钟产生
    • US5086387A
    • 1992-02-04
    • US203586
    • 1988-05-27
    • Ronald X. ArroyoJames T. Hanna
    • Ronald X. ArroyoJames T. Hanna
    • G06F1/08
    • G06F1/324G06F1/08Y02B60/1217
    • A clocking circuit connected to a processor for regulating processor operation and including a control circuit that produces a clock signal at a first frequency or for producing a clock signal at a designated one of a plurality of other selectable frequencies in response to a change signal from the processor. The control circuit is connected to a designating circuit that provides a signal to the control circuit to designate one of the selectable frequencies. In the preferred embodiment, the clocking circuit includes a register addressable by the processor and a frequency generator that generates several signals having unique frequencies. The processor may designate one of the frequencies as the clocking frequency by providing the appropriate data to the register. Upon the occurrence of an external event such as a DMA request or an interrupt, the control circuit will provide the clocking signal at a predetermined frequency.
    • 连接到处理器的时钟电路,用于调节处理器的操作,并包括一个控制电路,该控制电路产生一个第一频率的时钟信号,或响应于来自多个其它可选频率的改变信号产生一个指定的一个其他可选频率的时钟信号 处理器。 控制电路连接到指定电路,其向控制电路提供信号以指定可选频率之一。 在优选实施例中,时钟电路包括可由处理器寻址的寄存器和产生具有唯一频率的多个信号的频率发生器。 处理器可以通过向寄存器提供适当的数据来将频率中的一个指定为时钟频率。 在外部事件(例如DMA请求或中断)发生时,控制电路将以预定频率提供时钟信号。