| 摘要 |
PURPOSE:To reduce the useless time of an interruption process, by starting again the process of a main program, etc. when the interruption process is over, after a prescribed input terminal connected electrically to an interruption terminal is not attain to a prescribed level. CONSTITUTION:When an interruption request pulse of a low level is supplied to an interruption terminal IRQ from a waveform shaping circuit 1, the process of a main program is discontinued unless the interruption is inhibited. Then an interruption process is started. The level of an input port A is decided after the process is over for a prescribed interruption routine. When the port A is set at a low level, it is decided that the interruption request pulse exists yet. Thus the decision of level is repeated for the port A until the port A attains to a high level. In such way, the useless time is reduced to accelerate an overall program process time to a high speed. |
