| 摘要 |
PURPOSE:To improve the reliability by providing plural addresses to be accessed, to confirm the soundness of a program, and to easily confirm which address is not accessed owing to abnormal operation. CONSTITUTION:The abnormality monitor timer controller consists of a clear signal generating circuit 11, a power-ON reset circuit 12, an abnormality monitor timer circuit 13, a CPU 14, and an address decoder unit circuit 15, which consists of address decoder circuits 15-1, 15-2...15-n corresponding to plural access detecting means. Then access to plural addresses (AD1, AD2...ADn) which is repeated at a specific period is detected by an address decoder unit circuit 15 and the clear signal generating circuit 11 detects abnormality according to the time-up time of the abnormality monitor timer circuit and plural access detection signals A1, A2...An outputted by the address decoder unit circuit 15 and outputs alarm signal. |
