| 摘要 |
<p>PROBLEM TO BE SOLVED: To let a flash ROM suit a filling system by inhibiting access from a task to a storage block when that block is accessed by the other task. SOLUTION: The reading of an Nth sector is started and the Nth sector is locked by using a lock parameter. This lock parameter is managed by a storage place managing table 140. When any sector is already locked by the other sector, this Nth sector is locked after that sector was unlocked by the other task. The locked sector can be occupied by the present tank until it is unlocked. When a logical sector is locked, it is confirmed, while referring to the storage place managing table, whether effective data are stored in this sector or not. When the data have not been stored, a dummy data are read out as the contents of the sector. When the data have been stored, on the other hand, the data are read out of the flash ROM (or a main memory) based on the value of the recording place managing table.</p> |
