| 摘要 |
PURPOSE:To prevent such a case where the storage information of a memory is destructed by the slip-out of a guard caused by a trouble, etc., by applying the guard to the special conditions. CONSTITUTION:The write information 113 is written to a designated area of a memory 115 in response to a write permitting signal 111. A deciding means 123 checks whether or not the 1st prescribed relation is secured between both information of the 1st and 2nd guard signals 117 and 119. Then the means 123 produces a deciding signal 121 when said relation is secured. A guard control means 129 receives the 3rd guard signal 125 of a specific instruction and outputs a guard control signal 127 showing the supply of the signal 125. A write permitting means 131 receives both signals 127 and 121 and produces the signal 111 when the 2nd prescribed relation is secured between both signals 127 and 121. Then the signal 111 is supplied to the memory 115. |
