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.
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?