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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
For the time stamp capturing at message transmission the SOF signal of the transmit message is used
as the event trigger (see Figure 14-6).
The captured value from the CGTSC counter is written into particular data bytes of the transmit mes-
sage’s data field. Table 14-9 shows the scheme about which data bytes of the data field are replaced
with the time stamp capture value according to the setting of the M_DLCm register (m = 00 to 31).
Figure 14-6:
Time Stamp Capturing at Message Transmission
Table 14-9:
Transmitted Data On the CAN Bus (ATS = 1)
Note: CGTSC value captured at SOF.
Remark:
m = 00 to 31
M_DLC
m
Bus Data
1
Bus Data
2
Bus Data
3
Bus Data
4
Bus Data
5
Bus Data
6
Bus Data
7
Bus Data
8
1
M_DATAm
0
–
–
–
–
–
–
–
2
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
–
–
–
–
–
–
3
M_DATAm
0
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
–
–
–
–
–
4
M_DATAm
0
M_DATAm
1
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
–
–
–
–
5
M_DATAm
0
M_DATAm
1
M_DATAm
2
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
–
–
–
6
M_DATAm
0
M_DATAm
1
M_DATAm
2
M_DATAm
3
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
–
–
7
M_DATAm
0
M_DATAm
1
M_DATAm
2
M_DATAm
3
M_DATAm
4
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
–
8
M_DATAm
0
M_DATAm
1
M_DATAm
2
M_DATAm
3
M_DATAm
4
M_DATAm
5
lower 8-bit
of CGTSC-
Note
upper 8-bit
of CGTSC-
Note
SOF
ACK
Message
Temporary Buffer
capture
Time stamp (transmission):
transmisson as last
two data bytes
CAN Global Time
System Counter
Содержание mPD703128
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