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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.
So, you checked off two of my items - same crystal frequency and correct baudrate to be able to send to the PC.
What about the other items I listed?
Knowing that the two packages have different pinouts isn't the same as having verified that the serial data signal is reaching the correct pin on the processor, and with correct voltage levels and timing. Have you used an oscilloscope and checked?
Yes I verified the connection on the processor. checked with oscilloscope voltage level seems fine 5V..
But, if the serial data is arriving at that pin, you would not just see a 5V voltage, would you?
What, exactly, do you see? Is it valid serial data?