CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
11.4 Time Stamp Function
The FCAN controller supports a time stamp function. This function is needed to build a global time system.
The time stamp function is implemented using a 16-bit free-running time stamp counter.
Two types of time stamp function can be selected for message reception in the FCAN controller. Use bit 3 (TMR)
of the CAN1 control register (C1CTRL) to set the desired time stamp function. When the TMR bit is 0, the time stamp
counter value is captured after the SOF is detected on the CAN bus (see
Figure 11-2
) and when the TMR bit is 1, the
time stamp counter value is captured after the EOF is detected on the CAN bus (a valid message is confirmed) (see
Figure 11-3
).
Figure 11-2. Time Stamp Function Setting for Message Reception (When C1CTRL Register’s TMR Bit = 0)
Message
ACK field
EOF
SOF
<2>
<1>
Time stamp
counter
Temporary
buffer
M_TIMEn
CAN message buffer n
<Explanation>
<1> The time stamp counter value is captured to the temporary buffer when the SOF is detected on the CAN
bus.
<2> A message is stored in CAN message buffer n and the value in the temporary buffer is copied to the
M_TIMEn register in CAN message buffer n when the EOF is detected on the CAN bus.
Remark
n = 00 to 31
Содержание V850E/IA1 mPD703116
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