| 摘要 |
PURPOSE:To obtain very intelligible compact electronic equipment by the constitution wherein a timing system having an additional different function follows the timing system of 12hr and 24hr having a clock function. CONSTITUTION:A count up signal (f) becomes carrying up input from a minute in a clock counter and becomes a correcting signal from a control circuit in an alarm counter. Signals a-d are binary output signals to be sent to a decoder. Only an output signal (e) becomes a morning or afternoon output in 12hr system and becomes the highest bit output in a 24hr system. When the potential of the a 12hr indicating signal (g) is high, transmission gates 30-34 are turned on, and the 12hr signals appear at (a)-(e). When the potential of (g) is low, transmission gates 35-39 are turned on, and 24hr signals appear. In this constitution, the different timing system with an additional function can follow the timing system with a clock function, and very intelligible compact electronic equipment can be obtained. |
