| 摘要 |
<p>PURPOSE:To reduce the quantity of hardware and to prevent data from disappearing even if a timer number is not stored by installing a timer number latch register in a timer circuit and displaying a waiting bit. CONSTITUTION:If 'occupied' is displayed in an output 14, a clock 11 is not set to a timer number register 12 and a use/disuse flip flop 13, but the waiting bit 10 is displayed. A timer value 8 and the waiting bit 10, both of which are added in an random access memory 3, are written. When the clock 11 is displayed, the waiting bit 10 is not displayed. A signal 16 showing that an external device senses the output 14 and reads a timer number 15 displays 'disuse' in the output 14. In a detection circuit 9, if the added timer value 8 does not attain a fixed value and a waiting bit 5 is not displayed, only the timer value 8 is written in the memory 3.</p> |
