| 摘要 |
PURPOSE:To synchronize operation with clocks and also to make a counter output not instantaneous by operating the T input of a T flip-flop without using a reset terminal. CONSTITUTION:A value obtained by subtracting one from externally set value N3 is led to N-1 detecting circuit 4, which decides whether the value of counter 7 coincides with N-1 to output ''1'' when so or ''0'' when not. This output, and respective bits N1, N2, N3 and N4 of N are ANDed to input corresponding control signals S1, S2, S3 and S4 to exclusive-OR gates 2 of respective gates. Counter 7 returns the next ''0'' of N-1 and performs N-scale counter operation. |
