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[[File:UART-signal.png|thumb|400px|right|Example of a UART frame. In this diagram, one [[byte]] are sent, consisting of a start bit, followed by eight data bits (D0-7), and two stop bit, for a 11-bit UART frame. The number of data and formatting bits, the presence or absence of a parity bit, the form of parity (even or odd) and the transmission speed must be pre-agreed by the communicating parties. The "stop bit" is actually a "stop period"; the stop period of the transmitter may be arbitrarily long. It cannot be shorter than a specified amount, usually 1 to 2 bit times. The receiver requires a shorter stop period than the transmitter. At the end of each data frame, the receiver stops briefly to wait for the next start bit. It is this difference which keeps the transmitter and receiver synchronized.
BCLK = Base Clock]]
A UART frame consists of 5 element:
* Idle (logic high (1))
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