| 摘要 |
<p>A driving wave generation circuit is provided to reset a movement indication and switch a driving wave when a plurality of drive pulses are inputted by resetting a drive counter when a direction control signal is changed. A basic wave generation circuit(10) generates two kinds of basic waves which have different timings at a specific level, and different duty ratios at a specific level. Two kinds of basic waves have a predetermined basic period based on a basic clock. An unit counter(12) counts one period of a basic wave, and outputs a unit detection pulse when the count value reaches a predetermined number of units. A drive counter(14) counts an inputted drive pulse from an initial value to one direction. The drive counter(14) counts the count value to a direction of the initial value based on the unit detection pulse from the unit counter(12). A direction selector(22) receives two kinds of basic wave from the basic wave generation circuit(10), and selects the received two kinds of basic waves to be outputted to one of two output terminals. An output gate(20) receives the output of the direction selector(22), and outputs a driving wave having a couple of basic waves by allowing an output of the direction selector(22) until the drive counter(14) counts to one direction and reaches the initial value.</p> |
