| 摘要 |
PURPOSE:To quickly set exposure information, by presetting an intermediate exposure value, etc. whose use frequency is high, as an initial value, to a counter, etc. for updating a digital set signal by an electric power source turn-on operation. CONSTITUTION:When an electric power source is turned on, a monostable multivibrator is triggered, and by its output, an up-down counter 2 is controlled. As a result, a digital signal corresponding to exposure information is set, and to a counter 2 for updating this digital signal in order, a digital value corresponding to an exposure value of high use frequency, which has been applied to terminals P1-P5 is initialized. Subsequently, the digital value is updated in order, a set exposure value is applied to a CPU3, and exposure is controlled in accordance with the photometric quantity. According to this constitution, setting of the exposure information and the corresponding exposure control are executed quickly. |
