A MICROCONTROLLER HAVING SPECIAL MODE ENABLE DETECTION CIRCUITRY AND A METHOD OF OPERATION THEREFOR
    3.
    发明公开
    A MICROCONTROLLER HAVING SPECIAL MODE ENABLE DETECTION CIRCUITRY AND A METHOD OF OPERATION THEREFOR 审中-公开
    微控制器产生特殊“模式启用”检测电路包括用于操作DESSELBIGEN的一种方法

    公开(公告)号:EP0948764A1

    公开(公告)日:1999-10-13

    申请号:EP98955168.0

    申请日:1998-10-28

    CPC classification number: H03K19/1732 G06F1/22

    Abstract: A free-running microcontroller (i.e., one without any reset signal) is shown with special mode enable detect logic for placing the microcontroller into the test or special operations mode, without the benefit of a dedicated pin for such purposes. Rather, the instant invention implements the methodology of first applying a test voltage to indicate to the free-running microcontroller that the test mode is to be entered. Since the device has no reset signal to interrupt normal operation once it has begun, the test voltage is applied before the power supply VDD to ensure that the device enters test mode before it can enter normal operation.

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