| 摘要 |
PURPOSE: An input device of a microcomputer is provided to increase a calculation speed and a control speed of a microcomputer by detecting a variation of input data being supplied from an exterior, generating a trigger signal, connecting an active latch circuit for removing a noise ingredient of the input data by the trigger signal to input ports of each microcomputer, thereby removing a time necessary for sensing a variation of input data. CONSTITUTION: A filter(100) filters input data(IN1-INn) being supplied from an exterior. An active latch circuit(200) is connected to an output side of the filter(100), senses a variation of the input data(IN1-INn) supplied from an exterior, and generates an interrupt signal(INT0) when a variation of the input data(IN1-INn) is sensed. When the interrupt signal(INT0) is generated, the active latch circuit(200) receives the input data(IN1-INn) again. A microcomputer(300) is connected to an output side of the active latch circuit(200), reads the input data(IN1-INn) again when the interrupt signal(INT0) is generated, detects a noise of the input data(IN1-INn), and executes a calculation and a control for processing the input data(IN1-INn). The active latch circuit(200) senses a variation of the input data(IN1-INn), generates a trigger signal, and supplies the trigger signal to the microcomputer(300).
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