| 摘要 |
PURPOSE:To increase the resistance of a data processing system to a hit of power supply, the surge voltage, etc. by providing an RAM to store parity bits, and reding and checking the corresponding parity bit in a data reading mode. CONSTITUTION:When the data on a program, etc. is written to an incorporated RAM2, the parity bit corresponding to the data is produced by a parity bit producing circuit 6 on the basis of the data supplied to the RAM2. Then the parity bit is written to an RAM7 for parity bit. When the data is read out of the RAM2, the parity bit related to the data is also read out of the RAM7. At the same time, a parity bit is newly produced and compared with the parity bit which is read out of the RAM7. Then an interruption signal is outputted when the discordance is detected from said comparison. Then a data processing system is reset to its initial state. |
