| 摘要 |
PURPOSE:To improve the efficiency of interruption processing by adding a hardware to an interruption processing system of a microcomputer, and controlling a interruption input incapable of masking by a monitor. CONSTITUTION:If a non-maskable interruption input NMI incapable of masking is generated during the operation of the microcomputer 1, an NMI task starts an NMI mask flag control line 20-1 and sets up an NMI mask flag to prevent multiple NMI. Then, the NMI is processed and the NMI mask flag is reset by an NMI mask reset line 20-2. If it is necessary to start another task after the NMI processing, external interruption is set up by an interruption setting line 21-1, the whole registers are restored, then the NMI mask flag is reset. After completing the NMI processing, a monitor program executes external interruption processing, so that the NMI processing is recognized by the monitor program. Thus, the operating time of the monitor program is extremely shortened.
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