| 摘要 |
PURPOSE:To prevent a program from generating runaway and to reduce the load of a software designer by generating an interruption at the time of changing the contents of a specific area of a memory which can be optionally set up from an external bus master with software. CONSTITUTION:When an address based upon the external bus master coincides with the value of a register 3, an interruption signal 8 is outputted to a microprocessor part 1 as the output of a comparator 4. Namely, an interruption signal 8 is generated by comparing an address for data writing with a value previously set up in the register 3 at the time of writing data in the memory by the external bus master. Since the generation of runaway in the program can be prevented and respective operation areas of plural external bus masters are not mutually controlled, the load of the software designer can be reduced. |
