Oki Electric Industry Co., Ltd.

Oki Semiconductor Co., Ltd.

Hideaki Wada

Hirosuke Tabata

Atsuhiko Okada

Shingo Kazuma

Mitsuaki Watanabe

Hajime Iwai

In a wake-up control device for waking up a peripheral circuit such as a transmitter/receiver in a radio communication device, during a standby time in which an RF unit and a processing unit are powered off by a switch, an RF signal is received to produce a detection signal by a detector. The detection signal is transferred to the wake-up controller to be sampled. The header and other fields are detected and counted. A control signal is in turn produced by the respective counts to turn on the switch.

Wake-up controller and a method therefor for power control over peripheral circuitry based upon slots of a data field

An interrupt signal EMG is put out to a microprocessorwhen a thermal monitordetects that a package temperature exceeds a reference. The microprocessor then increases a frequency division value N stored in a frequency division value registerof a clock mechanism. An inputted clock signal MCK is divided by N to generate a system clock signal SCK. Therefore, the frequency of system clock signal SCK decreases when N increases. Consequently, electricity consumption of each function modulei decreases and the package temperature is reduced.

Temperature controlled semiconductor circuit

In a data rate converter, input data received in series synchronously with an input clock signal is converted into parallel data so as to be written into a memory, and the written parallel data is read from the memory and converted into serial data synchronously with an output clock signal so as to be outputted. Clock pulses of the input clock signal are counted to obtain an input count value. A ready signal is produced based on the input count value for allowing the start of reading the parallel data from the memory. The ready signal has a pulse width greater than two periods of the output clock signal. A trigger signal is produced upon detection of the second leading or trailing edge of the output clock signal within the pulse width of the ready signal. In response to the trigger signal, clock pulses of the output clock signal are counted to obtain an output count value. A read signal is produced based on the output count value for reading the parallel data from the memory.

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Kanagawa, Japan

Hideaki Wada