| 摘要 |
<p>PURPOSE:To improve the product yield of a single chip machine cycle, etc., provided with a low consumption power mode and to improve the reliability by reducing leak current in the low consumption power mode. CONSTITUTION:Between an external power source voltage supply terminal VCC such as a single chip microcomputer, etc., and a central processing unit module CPU, a memory module MEM, a peripheral device module PER and an input/output buffer module IO, switch circuits S1 to S4 which transmit external power source voltage VCC in a normal operation mode as it is and transmit the external power source voltage VCC in the low consumption power mode by clamping it to prescribed potential are provided, and the absolute value of the power source voltage of each module is selectively made smaller in the low consumption power mode. Thus, the leak current in the low consumption power mode is suppressed and the generation probability of a leakage fault after products are shipped is suppressed, maintaining the performance in the normal operation mode of the single chip microcomputer, etc.</p> |
