NEC V850ES/F 3-L Series User Manual page 544

Chapter 18
Table 18-13
Type Operation
Error active Transmission
Reception
Transmission
Reception
Error passive Transmission
Reception
Bus-off Transmission
Note
544
Types of error states
Value of error Indication of
counter CnINFO register
0 to 95 TECS1, TECS0 = 00
0 to 95 RECS1, RECS0 = 00
96 to 127 TECS1, TECS0 = 01
96 to 127 RECS1, RECS0 = 01
128 to 255 TECS1, TECS0 = 11
128 or more RECS1, RECS0 = 11
256 or more BOFF = 1,
(not TECS1, TECS0 = 11
Note
indicated)
The value of the transmission error counter (TEC) is invalid when the BOFF bit
is set to 1. If an error that increments the value of the transmission error
counter by +8 while the counter value is in a range of 248 to 255, the counter is
not incremented and the bus-off state is assumed.
User's Manual U18743EE1V2UM00
CAN Controller (CAN)
Operation specific to error state
Outputs an active error flag (6 consecutive
dominant-level bits) on detection of the error.
Outputs a passive error flag (6 consecutive
recessive-level bits) on detection of the error.
Transmits 8 recessive-level bits, in between
transmissions, following an intermission
(suspend transmission).
Communication is not possible.
Messages are not stored when receiving frames,
however, the following operations of <1>, <2>,
and <3> are done.
<1> TSOUT toggles.
<2> REC is incremented/decremented.
<3> VALID bit is set.
If the CAN module is entered to the initialization
mode and then transition request to any
operation mode is made, and when 11
consecutive recessive-level bits are detected
128 times, the error counter is reset to 0 and
the error active state can be restored.