NEC UPD703116 User Manual page 519

Figure 11-4. Time Stamp Function Setting for Message Transmission (When M_CTRL Register's ATS Bit = 1)
Time stamp
counter
<Explanation>
<1> The time stamp counter value is captured to the temporary buffer when the SOF is detected on the CAN bus.
<2> The value of the temporary buffer is added to the last 2 bytes of the data length code
to DLC0 of the M_DLCn register.
Note The ATS bit of the M_CTRLn register must be 1 and the data length must be more than 2 bytes to add
the time stamp counter value to the transmit message.
Remark n = 00 to 31
Table 11-3. Example When Adding Captured Time Stamp Counter Value to Last 2 Bytes of Transmit Message
Data Field Data 1
DLC
Not e 1
Bi t Val u e
1 M_DATAn0
register value
2 Note 2 Note 3
3 M_DATAn0 Note 2
register value
4 M_DATAn0 M_DATAn1
register value register value
5 M_DATAn0 M_DATAn1
register value register value
6 M_DATAn0 M_DATAn1
register value register value
7 M_DATAn0 M_DATAn1
register value register value
8 M_DATAn0 M_DATAn1
register value register value
9 to 15 M_DATAn0 M_DATAn1
register value register value
Notes 1. See 11.10 (2) CAN message data length registers 00 to 31 (M_DLC00 to M_DLC31).
2. The lower 8 bits of the time stamp counter value when the SOF is detected on the CAN bus
3. The higher 8 bits of the time stamp counter value when the SOF is detected on the CAN bus
Remark n = 00 to 31
CHAPTER 11 FCAN CONTROLLER
SOF
Message
<1>
Temporary
Data 2 Data 3 Data 4
− −
−
Note 3
Note 2 Note 3
M_DATAn2 Note 2
register value
M_DATAn2 M_DATAn3
register value register value
M_DATAn2 M_DATAn3
register value register value
M_DATAn2 M_DATAn3
register value register value
M_DATAn2 M_DATAn3
register value register value
User's Manual U14492EJ5V0UD
ACK field
<2>
buffer
Data 5 Data 6
− − −
− − −
− − −
− −
−
Note 3
Note 2 Note 3
M_DATAn4 Note 2
register value
M_DATAn4 M_DATAn5
register value register value
M_DATAn4 M_DATAn5
register value register value
EOF
Note
specified by bits DLC3
Data 7 Data 8
− −
− −
− −
− −
− −
− −
−
Note 3
Note 2 Note 3
Note 2 Note 3
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