| 摘要 |
PURPOSE:To facilitate the design of a circuit, to enable setting of an item of the output in a truth value table of ROM in relation to an arbitrary pulse width and to improve an integration on a mask layout, by composing a motor driving pulse generating circuit of ROM. CONSTITUTION:Input timing pulses Aa-Da from a frequency-dividing circuit 2 are controlled by a control circuit 4 on the basis of a control signal E from a signal generating circuit 3 and turn to be inputs Ab-Db of pulse generating ROM6. Meanwhile, the revolution/non-revolution of a motor 8 is detected 9 by a driver 7, while a mode signal generating circuit 5 delivers to ROM6 mode signals X, Y for selecting one motor-driving pulse F to be delivered subsequently out of a plurality of different pulse widths Fa-Fd according to a detected information signal G. ROM6 delivers the pulse F based on the pulses Ab-Db and the signals X, Y. |
