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Interrupt

Pratik Mahajan

Hello guys, can I monitor interrupt0 of 8051 by any h/w means like by LED or something? I have connected RTC DS12887 IRQ to INT0 however I couldn't see logic 1 on DMM

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  • 0 in reply to Pratik Mahajan

    If your C51 provides internal pull-up, then you do not need to add an external pull-up resistor.

    But as mentioned by Christoph Franck: You must make sure that your C51 does not drive the signal low.

    The Dallas chip can only sink the signal to ground. Without the chip connected, the processor pin should be high. If it isn't, then your processor hasn't support for an internal pull-up, or you haven't correctly configured your processor to activate the pull-up. Or you have instructed the C51 to drive the signal low.

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  • 0 in reply to Pratik Mahajan

    If your C51 provides internal pull-up, then you do not need to add an external pull-up resistor.

    But as mentioned by Christoph Franck: You must make sure that your C51 does not drive the signal low.

    The Dallas chip can only sink the signal to ground. Without the chip connected, the processor pin should be high. If it isn't, then your processor hasn't support for an internal pull-up, or you haven't correctly configured your processor to activate the pull-up. Or you have instructed the C51 to drive the signal low.

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