It is an object of the present invention to solve a problem that malfunction of communication is generated by varying a frequency of a clock due to noise from outside in a case where there is no supplied signal in a circuit which performs negative feedback control so that the supplied signal and the...http://www.google.com.tw/patents/US7885612?utm_source=gb-gplus-share專利 US7885612 - Clock generation circuit and semiconductor device provided therewith
