| 摘要 |
PURPOSE:To accurately read stored data of a PROM even if an error correction data is not written by externally controlling the function of an error corrector contained therein. CONSTITUTION:An error correction control register 1, a PROM 2, an error correction data storage PROM 3, an error corrector 4 are provided. If an error occurs in data of the PROM 2 corresponding to the input of the data of the PROM 2 and the data of the PROM 3 in the corrector 4, the data of the PROM 2 is corrected. When the data of the PROM 3 is undecided, information for invalidating the correcting function of the corrector 4 is previously written in the register 1. Thus, it is not necessary to externally write the correction data. |
