| 摘要 |
PURPOSE:To make it possible to generate a complicate timing pulse while saving ROM capacity by storing two ROMs with the state of the pulse signal, its continuation period, the repetitive pattern of a pulse pattern, and its kind. CONSTITUTION:When start signal 104 drops to a low level, the contents of the number-''0'' word of continuation period part 109 in ROM114 are set in counter 102. As clock signal 101 is set, the contents of the number-''0'' word of state part 111 in ROM114 are set in output register 113. When signal 101 is inputted and the contents of counter 102 reach a set value, counter 102 genertes carry signal 303. Because of the generation of signal 303, counter 105 counts up by one. As a result, the contents of continuation part 109 and state part 111 are set in counter 102 and register 113 respectively. Thus, register 113 outputs the contents of state part 111 successively and a pulse pattern is selected with output 162 of pulse generator 150. |
