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RM0016
Universal asynchronous receiver transmitter (UART)
377
22.3.1
UART character description
Word length may be selected as being either 8 or 9 bits by programming the M bit in the
UART_CR1 register (see Figure 114).
The UART_TX pin is in low state during the start bit. It is in high state during the stop bit.
An Idle character is interpreted as an entire frame of “1”s (the number of “1” ‘s includes the
start bit, the number of data bits and the number of stop bits).
A Break character is interpreted on receiving “0”s for a frame period. At the end of the
break frame the transmitter inserts either 1 or 2 stop bits (logic “1” bit) to acknowledge the
start bit.
Transmission and reception are driven by a common baud rate generator, the clock for each
is generated when the enable bit is set respectively for the transmitter and receiver.
The details of each block is given below.
Figure 114. Word length programming



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