| 摘要 |
PURPOSE: To lessen the number of pins of a main IC and the theoretical elements in the main IC inside. CONSTITUTION: Each one terminal of a switch SWA for determining a strobo state, a switch SWB for determining ISO 2, and a switch SWC for determining ISO 3 are earthed and the other terminal is connected to connection resistors 3-5, respectively and one terminal of a voltage dividing resistor 2 is connected in common with the connection resistors 3-5 in series and a KVC power source 1 is applied to the other terminal. The divided voltage values applied to respective switches and the connection resistors are inputted to an A/D converting circuit 9 through an analogue switch 15. Transmission of the divided voltage values from the A/D converting circuit 9 to a microcomputer 12 is carried out a serial communication clock line 10 and a serial communication data line 11 and ON/OFF signals of the switch SWD for determining ISO 1 are inputted to the microcomputer 12 through a decoder 14 and ON/OFF of the switches SWA, SWB, SWC are determined and together with the ON/OFF signals of the SWD, the camera state can be determined. |
