| 摘要 |
PURPOSE:To control effectively an engine of a car, by taking a prescribed time width determined depending on a built-in counter all as the unit of time measurement for applying interruption at each prescribed time. CONSTITUTION:A one-chip microcomputer MC is provided with a CPU1, an RAM2, and ROM3, a counter 4, an input port 5, and an output port 6 and the like. Further, the counter 4 counts a reference clock from a system clock generating circuit and the period of a count-up signal outputted from the counter 4 depends on preset data. A crank angle sensor DET1, an engine cooling water temperature sensor DET2, a suction amount sensor DET3, a ventilation oxygen density sensor DET4, and a car speed sensor DET5 are provided. An interruption is applied at each prescribed time to each sensor output by taking a prescribed time width determined with the counter 4 as the unit of time measurement. |
