| 摘要 |
PURPOSE:To ensure the low-cost representative display through the simple circuit, by securing such constitution in that just one unit of the memory or the individual display unit is provided enough for each terminal. CONSTITUTION:When a certain supervisory point of a certain address terminal unit is turned on, the output pulse is produced to data deciding circuit 3 via data pulse P0. And then representative display memory 4 is set to turn on display element 5. Then the 3rd control pulse P3 is produced, but memory 4 is not cleared since no H output is produced to display state memory 6. After this, clear control latch 7 is set with production of the 2nd control pulse P2, and the output of memory 4 is memorized in memory 6 when the 1st control pulse P1 is produced. And then latch 7 is set with the timing of P2 and in the address scanning period, and its Q output is turned to H. When the output of the above-mentioned supervisory point is turned off in the next address scanning period, the output of AND circuit 9 does not exist any more. And memory 4 is cleared with input of P3. |
