| 摘要 |
PURPOSE:To reduce the number of a signal terminal, by connecting a switching means provided on a body side and an accessory side to a common signal terminal and transferring data in time division through this signal terminal. CONSTITUTION:The first switching circuit which switches the data transfer between the body and a lens is constituted with switch circuits SC1 and SC2 of a circuit IF, a circuit FF3, a circuit AN4, a circuit OR3, and a circuit IN6 on the body side. The circuits SC1 and SC2 are made conductive alternately, and address data is sent to the lens side from a body-side shift register SR1 through terminals JB3 and JL3 while the circuit SC1 is made conductive, and lens data is sent to a body-side shift register SR2 through terminals JL3 and JB3 while the circuit SC2 is made conductive. The second switching circuit is constituted with switch circuits SC3 and SC4, a circuit FF7, a circuit AN30, a circuit OR5, and a circuit IN10 in the lens-side output part, and data transfer is switched on the lens side. A shift register SR3 sends address data inputted from the body side to terminals La0-La6 successively while the circuit SC3 is made conductive. |
