| 摘要 |
PURPOSE:To reduce the structure of a counter part to the half or so, by reading out the memory which stores the output signal waveform, by use of a counter which is able to change the additon count and the subtraction count. CONSTITUTION:In case of the initial state, the flip-flops 12-14 are reset, only the signal line A becomes ''0''. When the RS flip-flop 15 is set, the counter becomes 1 by a clock, and whenever a clock comes in, the counter is added by every 1. When the counter becomes 7, the flip-flop 15 is reset by a reset signal from ROMD, and the counter is subtracted by every ''1'' reversely. And the counter becomes its initial state, and the same operation is repeated. ROMC' outputs an output signal waveform by the value of the counter. |
