| 摘要 |
<p>PURPOSE:To prevent the erasion of the stored data by inhibiting the working of a write strobe generating circuit except the time point when data are written into a ROM from a processor. CONSTITUTION:When data are written into a ROM 2, a write signal is applied to a write strobe generating circuit 3 from a processor 1 and also to an action inhibiting circuit 4. At the same time, the data are applied from the processor 1 so that the circuit 4 is reset. Thus the circuit 4 is reset and the action inhibiting state of the circuit 3 is released. Then a write strobe pulse is applied to a write enable terminal WE of the ROM 2, and the data received from the processor 1 are written into the ROM 2.</p> |
