| 摘要 |
PURPOSE:To automatically restore the state normally, by applying interruption with the software, when an address not accessed at normal operation is referenced with a microprocessor unit. CONSTITUTION:A vacant part where no program and data are not written in a memory 4 is written in an operation code of software interruption. When a microcomputer references an address not accessed at normal operation and reads an operation code, the job under execution at present is interrupted and registers are saved to stacks. The stacks discriminates whether or not the software interruption exists and in case of the software interruption, when the power supply turns on, the job is started by taking the same address for the reset processing of the 1st job as a job start address. |
