NEC Renesas V850/SC1 User Manual page 653

(4) Error statuses
(a) Types of error statuses
The three types of error statuses are listed below.
Error active
Error passive
Bus off
• The error status is controlled by the transmit error counter and receive error counter (see 19.5.22
CANn error count register (CnERC)).
• The various error statuses are categorized according to their error counter values.
• When the error counter value reaches 96 or more, the bus status must be tested since the bus may
become seriously damaged.
• During start-up, if only one node is active, the error frame and data are repeatedly resent because no
ACK is returned even data has been transmitted.
Error Status Type
Error active
Error passive
Bus off
CHAPTER 19 FCAN CONTROLLER (V850/SC3)
Table 19-28. Types of Error Statuses
Operation Error Counter Value
Transmit/ 0 to 127
receive
Transmit 128 to 255
Receive 128 or more
Transmit 256 or more
User's Manual U15109EJ3V0UD
Type of Output Error Flag
Active error flag (6 consecutive dominant
level bits)
Passive error flag (6 consecutive recessive
level bits)
Transfer is not possible.
When a string of at least 11 consecutive
recessive level bits occurs 128 times, the
error counter is zero-cleared and error
active status can be resumed.
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