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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

    no actually RTC gives interrupt only when current time matches with predefined/alarm time

    Ok, I've dug out the data sheet for the part, and if I understand it correctly, this statement is not correct. The part has three different interrupt sources that can all lead to IRQ being set to low (active).

    anyway the zero on IRQ of RTC stays only for short amount of time(transient)

    That is also incorrect, according to the data sheet IRQ stays low until the control register C is read.

    Oh, and make sure that the 8051 isn't pulling the port pin to low (i.e. don't set the latch for the pin to 0).

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  • 0 in reply to Pratik Mahajan

    no actually RTC gives interrupt only when current time matches with predefined/alarm time

    Ok, I've dug out the data sheet for the part, and if I understand it correctly, this statement is not correct. The part has three different interrupt sources that can all lead to IRQ being set to low (active).

    anyway the zero on IRQ of RTC stays only for short amount of time(transient)

    That is also incorrect, according to the data sheet IRQ stays low until the control register C is read.

    Oh, and make sure that the 8051 isn't pulling the port pin to low (i.e. don't set the latch for the pin to 0).

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