Apparatus and method for processing information continuously even against extraneously incoming noise

An information processor for performing a predetermined process, the processor comprising:

• a CPU;
• storage means;
• noise detecting means for measuring extraneous noise by first and second reference levels, the second level being higher than the first level;
• write-protect means for saving important information, indispensable for continuing the predetermined process, on the storage means and protecting the information as non-rewritable if the noise detecting means has detected the noise at the first reference level while the predetermined process is being performed;
• suspension control means for getting the predetermined process suspended by the CPU at a point in time that the noise detecting means has detected the noise at the second reference level while the predetermined process is being performed;
• and
• resumption control means for getting the predetermined process resumed in accordance with the important information that has been saved by the write-protect means when the noise detecting means finds the detected noise lower than the first reference level while the predetermined process is being suspended.

A method for processing information so that a predetermined process is continuously executed using a CPU even if extraneous noise has been detected, the method comprising the steps of:

• protecting information needed for the predetermined process while the noise is lower than a predetermined level;
• suspending the CPU if the noise increases to exceed the predetermined level;
• and
• rebooting the CPU in accordance with the protected information if the noise decreases from the predetermined level.