| 摘要 |
PURPOSE:To continue the operation of a system without generating system down even when reset due to noise or the like is generated. CONSTITUTION:Data are successively recorded in two storage areas in an A system memory 13 and two storage areas in a B system memory 14 in a bus synchronous duplex system at a fixed period. When a reset signal is generated due to the generation of abnormality, the validity/ invalidity of the reset signal is judged from the up-to-date recorded information and the information judged as valid is outputted. Consequently a CPU can continue operation without generating system down again due to invalid information on the way of recording. |
