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Chapter 19
No.
<1>
<2>
<3>
<4>
<5>
652
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19.2.4 Error frame
An error frame is output by a node that has detected an error.
Error frame
R
D
(<4>)
<1>
6 bits
0 to 6 bits
Figure 19-15
Error frame
Note
D: Dominant = 0
R: Recessive = 1
Table 19-7
Definition of error frame fields
Bit
Name
count
Error flag 1
6
Error flag 2
0 to 6
Error delimiter
8
Error bit
–
Interframe space/
–
overload frame
Preliminary User's Manual U17566EE1V2UM00
<2>
<3>
(<5>)
8 bits
Interframe space or overload frame
Error delimiter
Error flag 2
Error flag 1
Error bit
Definition
Error active node:
Outputs 6 dominant-level bits consecutively.
Error passive node:
Outputs 6 recessive-level bits consecutively.
If another node outputs a dominant level while one node is outputting
a passive error flag, the passive error flag is not cleared until the
same level is detected 6 bits in a row.
Nodes receiving error flag 1 detect bit stuff errors and issues this
error flag.
Outputs 8 recessive-level bits consecutively.
If a dominant level is detected at the 8th bit, an overload frame is
transmitted from the next bit.
The bit at which the error was detected.
The error flag is output from the bit next to the error bit.
In the case of a CRC error, this bit is output following the ACK
delimiter.
An interframe space or overload frame starts from here.
CAN Controller (CAN)
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