RM0016 Universal asynchronous receiver transmitter (UART)
Doc ID 14587 Rev 8 357/449
22.7.10 Control register 6 (UART_CR6)
Address offset: 0x09
Reset value: 0x00
Note: This register is not available for UART1.
76543210
LDUM
Reserved
LSLV LASE
Reserved
LHDIEN LHDF LSF
rw rw rw rw rc_w0 rc_w0
Bit 7 LDUM: LIN Divider Update Method
0: LDIV is updated as soon as BRR1 is written (if no automatic resynchronization update occurs at
the same time).
1: LDIV is updated at the next received character (when RXNE=1) after a write to the BRR1 register.
LDIV is coded using the two register BRR1 and BRR2
This bit is reset by hardware once LDIV is updated with the measured baud rate at the end of the
synch field.
Bit 6 Reserved
Bit 5 LSLV: LIN Slave Enable
0: LIN Master Mode
1: LIN Slave Mode
Bit 4 LASE: LIN automatic resynchronisation enable
0: LIN automatic resynchronization disabled
1: LIN automatic resynchronization enabled
Bit 3 Reserved
Bit 2 LHDIEN: LIN Header Detection Interrupt Enable.
Header interrupt mask.
0: LIN header detection interrupt disabled
1: LIN header detection interrupt enabled
Bit 1 LHDF: LIN Header Detection Flag.
This bit is set by hardware when a LIN header is detected in LIN slave mode and cleared by software
writing 0.
0: LIN Header not detected
1: LIN Header detected (Break+Sync+Ident)
An interrupt is generated when LHDF=1 if LHDIEN=1
Bits 0 LSF: LIN Sync Field
This bit indicates that the LIN Synch Field is being analyzed. It is only used in LIN Slave mode. In
automatic resynchronization mode (LASE bit=1), when the UART is in the LIN Synch Field State it
waits or counts the falling edges on the RDI line.
It is set by hardware as soon as a LIN Break is detected and cleared by hardware when the LIN
Synch Field analysis is finished. This bit can also be cleared by software writing 0 to exit LIN Synch
State and return to idle mode.
0: The current character is not the LIN Synch Field
1: LIN Synch Field State (LIN Synch Field undergoing analysis)
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