Figure 18-54: Bus-Off Recovery (Except Normal Operation Mode With Abt) - NEC V850E/PH2 User Manual

Figure 18-54: Bus-Off recovery (Except Normal Operation Mode with ABT)

No No
Note: Clear all TRQ bits when re-initialization of message buffer is executed by clearing RDY bit
before bus-off recovery sequence is started.
Caution: When the transmission from the initialization mode to any operation modes is
requested to execute bus-off recovery sequence again in the bus-off recovery
sequence, reception error counter is cleared.
Therefore it is necessary to detect 11 consecutive recessive-level bits 128 times on
the bus again.
Remark: OPMODE: Normal operation mode, normal operation mode with ABT, receive-only mode,
single-shot mode, self-test mode
Chapter 18 AFCAN Controller
START START
BOFF = 1? BOFF = 1?
Yes Yes
Clear all TRQ bits Clear all TRQ bits Note Note
Set CnCTRL register Set CnCTRL register
(Clear OPMODE) (Clear OPMODE)
Access to registers other than Access to registers other than
CnCTRL and CnGMCTRL CnCTRL and CnGMCTRL
registers registers
Forced recovery from bus off? Forced recovery from bus off?
Yes Yes
Set CCERC bit Set CCERC bit
Set CnCTRL register Set CnCTRL register
(Set OPMODE) (Set OPMODE)
END END
User's Manual U16580EE3V1UD00
No No
Set CnCTRL register Set CnCTRL register
(Set OPMODE) (Set OPMODE)
Wait for recovery Wait for recovery Wait for recovery
from bus off from bus off from bus off
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