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RI (Receive Interrupt) flag problem in SCON register (Serial Communication)

Maor Atias

Hello,
I need help with the serial communication, when I am sending data from PC (hyper-terminal) through RS232 , RI flag should rise to '1' and its does not happened, what may be the problem?

BTW, when I am programming the same device in the PLCC package the flag is triggered, I am currently use the VQFP package witch I have problem with.

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  • 0

    What debugging have you done?

    - does the data arrive at the correct pin of the processor - maybe CAD symbol is incorrect?
    - does it have the correct voltage levels?
    - does it have the correct baudrate - easy to check that the chip sends with same baudrate as the PC.
    - is hyperterminal configured to require hw handshake signals?
    - are there any known differences between the two chips, besides the package?
    - both chips using same crystal frequency?
    - does everything else work ok with the VQFP-based design?

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  • 0

    What debugging have you done?

    - does the data arrive at the correct pin of the processor - maybe CAD symbol is incorrect?
    - does it have the correct voltage levels?
    - does it have the correct baudrate - easy to check that the chip sends with same baudrate as the PC.
    - is hyperterminal configured to require hw handshake signals?
    - are there any known differences between the two chips, besides the package?
    - both chips using same crystal frequency?
    - does everything else work ok with the VQFP-based design?

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