| 摘要 |
PURPOSE:To separately execute the simulation with regard to a specific input/ output by providing a memory mapped I/O area, a real status area, a simulation status area, a rewritable mode area, and a rewriting control means. CONSTITUTION:When a program is started, an instruction designated by a program counter from a user program is read out of an I/O area A and decoded. Subsequently, an input/output mode setting state is referred to in a mode area C. When setting is a real mode, the contents of the part concerned in a real status area B are rewritten to the data concerned, and next, the part concerned of a simulation status B' is rewritten to the same contents as the part concerned of the real status area B. When rewriting is ended, synchronous matching is contrived between the areas B,B'. When setting is a simulation mode, only the part of the area B' is rewritten, there is no influence in the area B, and data is not outputted. An area C can be changed by a bit unit, and switching of the mode can be executed separately by an input/output unit. At the time of rewriting of the area C, as well, synchronous matching of data of the areas B,B' is contrived, therefore, the continuity of the control is held. |
