Figure 255. Break Detection In Lin Mode (11-Bit Break Length - Lbdl Bit Is Set) - ST STM32F40 Series Reference Manual

Universal synchronous asynchronous receiver transmitter (USART)

Figure 255. 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
RX line
Capture Strobe
Break State machine
Read Samples
Case 2: break signal just long enough => break detected, LBD is set
RX line
Capture Strobe
Break State machine
Read Samples
LBD
Case 3: break signal long enough => break detected, LBD is set
RX line
Capture Strobe
Break State machine
Read Samples
LBD
769/1422
Break Frame
Idle Bit0 Bit1 Bit2 Bit3
0 0 0 0
Break Frame
Idle Bit0 Bit1 Bit2 Bit3
0 0 0 0
Break Frame
Idle Bit0 Bit1 Bit2 Bit3
0 0 0 0
Doc ID 018909 Rev 4
Bit4 Bit5 Bit6 Bit7 Bit8
0 0 0 0 0
Bit4 Bit5 Bit6 Bit7 Bit8
0 0 0 0 0
Bit4 Bit5 Bit6 Bit7 Bit8
0 0 0 0 0
Bit9 Bit10 Idle
0 1
delimiter is immediate
Bit9 B10 Idle
0 0
Bit9 Bit10 wait delimiter Idle
0 0
RM0090