| 摘要 |
PURPOSE:To prevent the run-away of a motor due to noise by latching parallel motor control data to be sent to a motor driving control circuit only when a control signal corresponding to a mode is generated by a decoding circuit. CONSTITUTION:A motor control signal decoding circuit 10 is controlled by a microprocessor 1, and command data converted serially by a shift register 5 is inputted in parallel to the AND logic circuit part 6a of a decoding logic circuit 6. An OR logic circuit part 6b is provided with an OR circuit 9, and only when input data is inputted by correct data, and in addition, one of the signals of mode control signal lines 7a, 7b, 7c is decoded surely, an AND circuit 11 gates a latch signal from the microprocessor 1, and sends the latch signal 11a to a latch register 12. Thus, only when a correct mode signal is generated, the motor control data of the motor driving control circuit 8 is updated, and the run-away of the motor due to the noise can be prevented. |
