ST STM8S Reference Manual

RM0016 Universal asynchronous receiver transmitter (UART)
Doc ID 14587 Rev 8 349/449
Bit 3 OR: Overrun error
(2)
This bit is set by hardware when the word currently being received in the shift register is ready to be
transferred into the RDR register while RXNE=1. An interrupt is generated if RIEN=1 in the
UART_CR2 register. It is cleared by a software sequence (a read to the UART_SR register followed
by a read to the UART_DR register).
0: No Overrun error
1: Overrun error is detected
LHE LIN Header Error (LIN slave mode)
During LIN Header reception, this bit signals three error types:
– Break delimiter too short
– Synch Field error
– Deviation error (if LASE=1)
– Identifier framing error
0: No LIN Header error
1: LIN Header error detected
Bit 2 NF: Noise flag
(3)
This bit is set by hardware when noise is detected on a received frame. It is cleared by a software
sequence (a read to the UART_SR register followed by a read to the UART_DR register).
0: No noise is detected
1: Noise is detected
Bit 1 FE: Framing error
(4)
This bit is set by hardware when a de-synchronization, excessive noise or a break character is
detected. It is cleared by a software sequence (a read to the UART_SR register followed by a read to
the UART_DR register).
0: No Framing error is detected
1: Framing error or break character is detected
Note: For the UART2 and UART3, in LIN slave mode (bits LINE and LSLV are set), when a framing
error is detected in the Synch or Identifier Fields , the FE bit is set. But the FE bit will not be set
when a Break reception is detected.
Bit 0 PE: Parity error
This bit is set by hardware when a parity error occurs in receiver mode. It is cleared by a software
sequence (a read to the status register followed by a read to the UART_DR data register). You have
to wait for the RXNE flag to be set before clearing it. An interrupt is generated if PIEN=1 in the
UART_CR1 register.
0: No parity error
1: Parity error (or, in LIN slave mode, identifier parity error)
1. The IDLE bit will not be set again until the RXNE bit has been set itself (i.e. a new idle line occurs)
2. When this bit is set, the RDR register content will not be lost but the shift register will be overwritten.
3. This bit does not generate interrupt as it appears at the same time as the RXNE bit which itself generates an interrupt.
4. This bit does not generate interrupt as it appears at the same time as the RXNE bit which itself generates an interrupt. If the
word currently being transferred causes both frame error and overrun error, it will be transferred and only the OR bit will be
set.

ST STM8S Specifications

General

Brand	ST
Model	STM8S
Category	Microcontrollers
Language	English