XC886/888CLM
Controller Area Network (MultiCAN) Controller
User’s Manual
15-20
V1.3, 2010-02
MultiCAN, V1.0
Synchronization Analysis
The bit time synchronization is monitored if NFCRx.CFSEL = 010
B
. The time between
the first dominant edge and the sample point is measured and stored in the NFCRx.CFC
bit field. The bit timing synchronization offset may be derived from this time as the first
edge after the sample point triggers synchronization and there is only one
synchronization between consecutive sample points.
Synchronization analysis can be used, for example, for fine tuning of the baud rate
during reception of the first CAN frame with the measured baud rate.
Driver Delay Measurement
The delay between a transmitted edge and the corresponding received edge is
measured when NFCRx.CFSEL = 011
B
(dominant to dominant) and
NFCRx.CFSEL = 100
B
(recessive to recessive). These delays indicate the time needed
to represent a new bit value on the physical implementation of the CAN bus.
*
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