| 摘要 |
According to a stepping motor control circuit of the invention, a rotation detecting period is divided into a first segment for detecting an induced signal generated at least in a second quadrant by the rotation of a rotor immediately after driving of a main driving pulse, a second segment being provided after the first segment for detecting the induced signal in a third quadrant, and a third segment provided after the second segment and, when a stepping motor detects the induced signal exceeding a reference threshold voltage in the first segment and the second segment, a control circuit controls a pulse down counter circuit to output a pulse down control signal.
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