| 摘要 |
PROBLEM TO BE SOLVED: To make efficiently debuggable a user program without spoiling its execution environment and response performance, by specifying an interruption of a specified level and accepting the interruption selectively even during a supervisor interruption process. SOLUTION: A system register unit 3 sets whether a mask is reset or not, and an interruption level as to the interruption of specific level and a temporary register 14 latches the interruption level set by the system register 3 with a supervisor interruption(SVI) signal. A temporary register 13 latches the interruption level of an externally inputted interruption signal with a maskable interruption signal. Then, a comparing circuit 16 compares both temporary registers 14 and 13 with each other and outputs a coincidence signal and a mask control circuit masks an internal SVI signal in response to the coincidence signal. Even in a maskable interruption inhibited state by SVI execution, the interruption of the specific level is specified and the mask is reset to accept the interruption. |
