TC1796
Peripheral Units (Vol. 2 of 2)
Controller Area Network (MultiCAN) Controller
User’s Manual 22-35 V2.0, 2007-07
MultiCAN, V2.0
Figure 22-14 Loop-Back Mode
22.3.7.3 Bit Timing Analysis
Detailed analysis of the bit timing can be performed for each CAN node using the
analysis modes of the CAN frame counter. The bit timing analysis functionality of the
frame counter may be used for automatic detection of the CAN baud rate, as well as to
analyze the timing of the CAN network.
Bit timing analysis for CAN node x is selected when bit field NFCRx.CFMOD = 10
B
. Bit
timing analysis does not affect the operation of the CAN node.
The bit timing measurement results are written into the NFCRx.CFC bit field. Whenever
NFCRx.CFC is updated in bit timing analysis mode, bit NFCRx.CFCOV is also set to
indicate the CFC update event. If NFCRx.CFCIE is set, an interrupt request can be
generated (see Figure 22-11).
CAN
Node 0
NPCR0.LBM
0
1
External
CAN Bus 0
Internal
CAN Bus
CAN
Node 1
NPCR1.LBM
0
1
External
CAN Bus 1
CAN
Node 2
NPCR2.LBM
0
1
External
CAN Bus 2
CAN
Node 3
NPCR3.LBM
0
1
External
CAN Bus 3
MCA05840
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