| 摘要 |
<p>PURPOSE:To form a semiconductor integrated circuit provided with a standby circuit having a small area, which can be manufactured at a moderate price, by using a peak sensor instead of a counter. CONSTITUTION:When a high level is inputted through a standby instruction terminal 5, An FF composed of NOR gates 12 and 13 outputs a low level. As a result, as soon as a CPU 14 stops its arithmetic, an oscillator 8 stops its oscillation. When the low level is inputted through the instruction terminal 5. The oscillator 8 starts its oscillation. When the oscillation is stabilized and its amplitude reaches the threshold of the peak sensor 11, the FF composed of the NOR gates 12 and 13 is reset, and the CPU 14 starts its arithmetic. Thus the number of elements is reduced, and the chip area of an LSI can be minimized. Accordingly its cost can be reduced.</p> |
