change in serial port setting of parity or stop bits number HAS NO problem????

There isn't a 9th bit for parity. If parity is used it is the high order 8th bit of the 8 bits of data.

I'm not sure what 8E1 has come to mean, but the AVR is definitely capable of generating 8 bit data frames PLUS an additional parity bit... (section 19.4 "Frame Formats"):

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