Abstract: An electronic clock makes no erroneous determination of rotation detection and suppresses unnecessary current consumption even when being provided with a second hand having a large moment of inertia. The electronic clock uses a first detection mode determination circuit and a second detection mode determination circuit to perform the rotation detection. The electronic clock includes a determination selecting circuit as changing means for changing the determination period of the second detection mode in accordance with the determination period of the first detection mode. Even when the current waveform is disturbed, erroneous determinations are prevented in a way that the determination terminal of the second detection mode is shortened if the first detection mode terminates earlier.

Abstract: Provided is an electronic clock which makes no erroneous determination of rotation detection and suppresses unnecessary current consumption even when being provided with the second hand having a large moment of inertia. The electronic clock uses a first detection mode determination circuit 112 and a second detection mode determination circuit 113 to perform the rotation detection. The electronic clock includes a determination selecting circuit 113c as changing means for changing the determination period of the second detection mode in accordance with the determination period of the first detection mode. Even when the current waveform is disturbed, erroneous determinations are prevented in a way that the determination terminal of the second detection mode is shortened if the first detection mode terminates earlier.