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Hu:
Al is correct that the processing of the parity bit is in the UART and takes no additional processing time in the CPU other than testing the UART parity bit and this is negligble.
As I previously indicated using parity adds 1 bit to the asynchronous word, thus approximately 10% to transmission time. This is a small price to pay for error detection.
But still remember that XMODEM is better for error detection because it effectively includes correction up to a point.
You are far better off with parity enabled as I previously discussed.
There is a lot of information presented on various web sites that is not based on basic fundamentals.
For example, it is very hard to find a source that gives the precise relationship between inches and centimeters. The answer for the exact relationship is 1 inch = 2.54 cm with as many zeroes to the right as you want. Whereas 39.37 in = 1 meter is only an approximation.
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