| 摘要 |
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.
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