Hitachi, Ltd.

Kenzo Funatsu

Takashi Ito

Naoki Yashiki

Kenichi Ishibashi

Katsumi Iwata

Keiji Kubuyama

Chiaki Kubumura

Chiaki Kubomura

Keiji Kuboyama

A data processor comprises a multifrequency receiver formed together with a central processor on a semiconductor substrate. The multifrequency receiver produces digital data for identifying a tone wave included in a multifrequency analog signal or produces an identification result in accordance with the condition or signal issued by the central processor. The multifrequency receiver is thereby operative to deal with tone waves which are flexible in type and input analog signals which are flexible in their frequency band, and has increased latitude of choice for the operational characteristics and function such as the number of sampling periods of input analog signals and the discrimination accuracy.

Data processor

Operation of a clock generating circuit is stopped when the oscillation signals to be selectively transmitted to the clock generating circuit via a multiplexer are switched. The oscillation signals are generated by a first oscillation circuit at a relatively high frequency and by a second oscillation circuit which steadily oscillates at a relatively low frequency. The clock generating operation is resumed in synchronization with the switched oscillation signals.

Semiconductor integrated circuit having a plurality of oscillation

A data processor comprises a multifrequency receiver formed together with a central processor on a semiconductor substrate. The multifrequency receiver produces digital data for identifying a tone wave included in a multifrequency analog signal or produces an identification result in accordance with the condition of signal issued by the central processor. The multifrequency receiver is thereby operative to deal with tone waves which are flexible in type and input analog signals which are flexible in their frequency band, and has increased latitude of choice for the operational characteristics and function such as the number of sampling periods of input analog signals and the discrimination accuracy.

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Musashimurayama, Japan

Kenzo Funatsu