| 摘要 |
<p>PURPOSE:To prevent plural cursor pattern data from being outputted by the same timing by disabling a comparator by an output signal of a flip-flop. CONSTITUTION:When a data output is permitted once, until a vertical or horizontal retrace line period end signal is detected, the respective comparators 3, 6 are disabled, and flip-flops 7, 8 are used as its means. The flip-flops 7, 8 are provided on the post-stage of each comparator 3, 6, set by a coincidence signal from the comparators 3, 6, and reset by the retrace line period end signal. In such a way, the coincidence signal is outputted only once in one raster period, and even when a value of each register 2, 5 is rewritten, it is prevented that cursor data are outputted simultaneously.</p> |
