Figure 254. Break Detection In Lin Mode (11-Bit Break Length - Lbdl Bit Is Set) - ST STM32F412 Reference Manual

RM0402 Universal synchronous receiver transmitter (USART) /universal asynchronous receiver
detection circuit receives either a '1, if the break word was not complete, or a delimiter
character if a break has been detected.
The behavior of the break detector state machine and the break flag is shown in
Examples of break frames are given on
break length), and M=0 (8-bit data).

Figure 254. Break detection in LIN mode (11-bit break length - LBDL bit is set)

Case 1: break signal not long enough => break discarded, LBDF is not set
RX line
Capture strobe
Break state
machine
Read samples
Case 2: break signal just long enough => break detected, LBDF is set
RX line
Capture strobe
Break state
machine
Read samples
LBDF
Case 3: break signal long enough => break detected, LBDF is set
RX line
Capture strobe
Break state
machine
Read samples
LBDF
Idle Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9 Bit10
0 0 0
Idle Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9 B10
0 0 0
Idle Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9 Bit10
0 0 0 0
RM0402 Rev 6
Figure 255, where we suppose that LBDL=1 (11-bit
Break frame
0 0 0 0
Break frame
0 0 0 0
Break frame
0 0 0 0
Figure
Idle
0 0 0 1
Delimiter is immediate
Idle
0 0 0 0
wait delimiter
0 0 0
254.
Idle
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