| 摘要 |
PURPOSE:To shorten the time for a test of the titled device provided with a multiple stage frequency dividing circuit by a method wherein the device is provided with a gate circuit transmitting reference frequency signals into a intermediate frequency dividing stage. CONSTITUTION:A reference frequency signal OSC are divided frequency-wise and amultiple stage frequency dividing circuit is formed of T type flip-flops F1-Fn supplying frequency divided signals into a controlling circuit CONT exemplifiedly belonging in a camera. Provided between the flip-flops Fm and Fm+1 is a gate network consisting of AND gates G1 and G2 and OR gate G3 which selectively transmits Fm output signals and reference frequency signals OSC into the flip-flop Fm+1 in the next stage in compliance with controlling signals C. In a test, when ''1'' is used as a controlling signal C, a higher frequency goes into the dividing stage Fm+1-Fn, enabling a divided frequency signal formed in a very short period of time. |
