Abstract: 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.

Abstract: 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.

Abstract: An interrupt signal EMG is put out to a microprocessor 10 when a thermal monitor 40 detects that a package temperature exceeds a reference. The microprocessor then increases a frequency division value N stored in a frequency division value register 31 of a clock mechanism 30. 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 module 20i decreases and the package temperature is reduced.

Abstract: An interrupt signal EMG is put out to microprocessor 10 when package temp. is detected by thermal monitor 40 that it exceeded reference temp. Thus, rewriting of frequency division value N of freq.div.val.register 31 in clock gear mec. 30 to increase it is performed by microprocessor 10. In frequency division circuit 32, inputted clock signal MCK is divided into 1/N by freq.div.value N set in freq.div.val.register 31, so as to generate system clock signal SCK. Therefore, frequency of system clock signal SCK decreases with the increase of freq.div.value N. Consequently, electricity consumption of each module 20i decreases, increase of package temp. is restrained, and malfunction from overheat can be prevented.