Semiconductor integrated circuit and abnormal oscillation detection method for semiconductor integrated circuit

摘要

A semiconductor device includes a first oscillator that generates a first clock signal, a second oscillator that generates a second clock signal in response to the first clock signal, a third oscillator that generates a third clock signal, a counter that counts a signal corresponding to the first clock signal or a signal corresponding to the second clock signal during a predetermined period that is set based on the third clock signal to generate an overflow signal indicating that a count value of the signal corresponding to the first clock signal or the signal corresponding to the second clock signal exceeds a predetermined value, and an abnormality notice unit that receives the overflow signal to generate an abnormal signal indicating that an abnormal oscillation occurs in at least one of the first to third clock signals.

主权项

1. A semiconductor device comprising:
a first oscillator that generates a first clock signal; a second oscillator that generates a second clock signal in response to the first clock signal; a third oscillator that generates a third clock signal; a counter that counts a signal corresponding to the first clock signal or a signal corresponding to the second clock signal during a predetermined period that is set based on the third clock signal to generate an overflow signal indicating that a count value of the signal corresponding to the first clock signal or the signal corresponding to the second clock signal exceeds a predetermined value; and an abnormality notice unit that receives the overflow signal to generate an abnormality signal indicating that an abnormal oscillation occurs in at least one of the first to third clock signals.