STMicroelectronics STM32F405

Universal synchronous asynchronous receiver transmitter (USART) RM0090
986/1731 DocID018909 Rev 11
The behavior of the break detector state machine and the break flag is shown on the
Figure 305: Break detection in LIN mode (11-bit break length - LBDL bit is set) on page 986.
Examples of break frames are given on Figure 306: Break detection in LIN mode vs.
Framing error detection on page 987.
Figure 305. Break detection in LIN mode (11-bit break length - LBDL bit is set)
Case 1: break signal not long enough => break discarded, LBD is not set
Break Frame
RX line
Break State machine
Capture Strobe
0
Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9
Idle Idle
Read Samples
Bit0
0000000001
Bit10
Break Frame
RX line
Break State machine
Capture Strobe
0
Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9
Idle Idle
Read Samples
Bit0
0000000000
B10
Case 2: break signal just long enough => break detected, LBD is set
LBD
Break Frame
RX line
Break State machine
Capture Strobe
0
Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9
Idle Idle
Read Samples
Bit0
0000000000
Bit10
Case 3: break signal long enough => break detected, LBD is set
wait delimiter
LBD
delimiter is immediate