upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 537

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

16.2.4 Error frame
An error frame is output by a node that has detected an error.
Remark:
<1>
<2>
<3>
<4>
<5>
No.
Error flag 1
Error flag 2
Error delimiter
Error bit
Interframe space/
overload frame
D: Dominant = 0
R: Recessive = 1
Name
R
D
(<4>)
Bit Count
6 bits
Table 16-7: Definition of Error Frame Fields
<1>
0 to 6
6
8
–
–
User’s Manual U16702EE3V2UD00
Error frame
0 to 6 bits
Chapter 16 FCAN Controller
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 trans-
mitted 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.
Figure 16-15: Error Frame
<2>
<3>
8 bits
(<5>)
Interframe space or overload frame
Error delimiter
Error flag 2
Error flag 1
Error bit
Definition
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