Oscillation-stop detection circuit, semiconductor device, timepiece, and electronic device

摘要

An oscillation-stop detection circuit can be manufactured at low cost without requiring controlling difficult manufacturing process conditions. Inverter 30 outputs an oscillation state detection signal. N-channel transistor 26 is a transistor that discharges capacitor 20. A reference voltage generator 21 includes a depletion-mode P-channel transistor 22 of which the gate and source are connected together, and a N-channel transistor 23 of which the gate and drain are connected together, N-channel transistor 23 and N-channel transistor 26 rendering a current mirror.