| 摘要 |
PURPOSE:To inform the operation of a timer before a prescribed time for the timer operation, by providing two sets of frequency dividers 2 and using one as operation information, in a digital type timer. CONSTITUTION:When a start signal SP is applied, an oscillation circuit 2 starts oscillation operation and outputs an output (b) to frequency dividers 3 and 4. The frequency divider 3 frequency-divides the oscillator output (b) and inverts an FF5 with an output c after a prescribed time. The frequency-divider 4 frequency- divides the oscillation output (b) and produces an output (e) after the point of time of the generation of the output (c). The output epasses through an AND gate 12 which is set with the output Q of the FF5 and triggers a one-shot multivibrator circuit 6. A one-shot multivibrator 10 is triggerd at the fall of an output pulse (g) of the circuit 6, an FF11 is inverted with an output pulse (h) and the oscillation circuit 2, the frequency dividers 3 and 4, and the FF5 are reset. |
