| 摘要 |
PURPOSE:To enable the display of 0 to m number, by using the m notation counter and BCD-m decoder. CONSTITUTION:When the counter 2 and the memory 4 are reset, the terminal 0 of the decoder 3 and the memory output are also L and the element 70 is illuminated. The terminal 1 of the decoder is at L with one pulse, the element 71 is illuminated, the memory 4 is at H, and the element 70 is distinguished. The element 7n is illuminated with the count value n and the count value returns to 0 with the next input pulse. In this case, since the memory output is at H, the element 70 is not illuminated, the L output of the decoder terminal 0 is inverted 5, the element 7n+1 is illuminated via the NAND gate 6, the count of the counter is at 1 with the next pulse to illuminate the element 71. The decimal notation counter and BCD-decimal decoder can illuminate 0 to 9, but the illumination control of elements from 0 to 10 can be made with this constitution. |
