ST STM8S - Figure 117. Data Sampling for Noise Detection

RM0016 Universal asynchronous receiver transmitter (UART)
Doc ID 14587 Rev 8 319/449
When an overrun error occurs:
● The OR bit is set.
● The RDR content will not be lost. The previous data is available when a read to
UART_DR is performed.
● The shift register will be overwritten. The second data received during overrun is lost.
● An interrupt is generated if the RIEN bit is set.
● The OR bit is reset by a read to the UART_SR register followed by a UART_DR register
read operation.
Noise error
Over-sampling techniques are used for data recovery by discriminating between valid
incoming data and noise.
Figure 117. Data sampling for noise detection
Note: The sample clock frequency is 16x baud rate.
RX LINE
Sample
clock
1234567891011
12
13 14 15 16
sampled values
One bit time
6/16
7/16
7/16