| 摘要 |
<p>PURPOSE:To share a signal line by a transmission side, and a reception side, to send data by the transmission side according to the command of the reception side, and to unify the signal line of a system, by providing a pull-up resistance at the signal line connected to each open collector circuit in a transmission part, and a reception part. CONSTITUTION:A reception part 2, and a transmission part 3 are connected with a signal line 1, and a positive power source voltage V is impressed on both ends of a pull-up resistance R provided at the signal line 1. A clock CL is added on an open collector circuit 21, and a shift register 23 in the reception part 2, and a NOT circuit 22 which identifies a signal S1 from the transmission part 3, is provided between the connection point of the signal line 1 and a circuit 3, and the input terminal IN of the register 23. Also, an open collector circuit 35, and a non-inversion gate circuit 31 in the transmission part 3 are connected to the signal line 1, and the signal line 1 is shared by the transmission part 3, and the reception part 2, and the transmission part 3 sends the signal S1 by the command from the reception part 2.</p> |
