Patent ID: 9467148
Filing Date: 2016-10-11
CPC Classification: H03B,H03L

Claim Text:
1. An oscillation circuit comprising: a power source detector that is configured to detect whether a predetermined voltage is applied to the oscillation circuit; a determining device that is configured to detect a predetermined signal that is input to the oscillation circuit; and a controller that is configured to count a predetermined time period and that is configured to select one of a first operation mode and a second operation mode of the oscillation circuit, wherein the predetermined time period corresponds to an elapsed time from a detection time at which the power source detector detects the predetermined voltage so that the predetermined time period expires at an expiration time, the controller selects the first operation mode when the determining device detects the predetermined signal within the predetermined time period, the controller selects the second operation mode at the expiration time of the predetermined period, and the second operation mode corresponds to a normal operation in which the oscillation circuit outputs oscillation signals, and the first operation mode corresponds to an operation other than the normal operation.