| 摘要 |
PURPOSE:To make unnecessary a memory access to recognize an instruction code part to cause a trap by storing the instruction code of an instruction to cause the trap into a special register when a special instruction code is inputted and the trap is caused. CONSTITUTION:In an instruction code analyzing routine, first, the branching is executed to a processing routine 1 classified by an instruction with the value of an EXR 111. Next, an instruction inherent processing is executed. In order to execute the instruction of the next address of the instruction to cause the trap, the contents of the address value '2FFAH' of an external memory 11 pointed out by an SP113, namely, a peak address value '0150H' of the instruction to cause the trap are incremented. A return instruction place at the last of the instruction individual processing routine 1 is executed. |
