NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 803 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
1 = Initialization is started.
Note:
The busoff recovery sequence (see CAN Specification Rev. 2.0) cannot be shortened by setting
or resetting the Init bit. If the device goes in the busoff state, it will set Init of its own accord, stopping
all bus activities. Once Init has been cleared by the CPU, the device will then wait for 129 occurrences
of Bus Idle (129 * 11 consecutive recessive bits) before resuming normal operations. At the end of the
busoff recovery sequence, the Error Management Counters will be reset.
During the waiting time after resetting Init, each time a sequence of 11 recessive bits has been
monitored, a Bit0Error code is written to the Status Register, enabling the CPU to readily check up
whether the CAN bus is stuck at dominant or continuously disturbed and to monitor the proceeding of
the busoff recovery sequence.