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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(b) Reception in a transmit message buffer
When the FCAN system searches for the corresponding message buffer after reception of a
remote frame and finds a message buffer with a matching identifier, which is defined for transmis-
sion, the content of the remote frame is not stored but programmable reactions are launched.
Accepting a remote frame for a transmit message buffer does not change the content of the trans-
mit message buffer except the DN flag of the M_STATm register depending on the setting of the
RMDE0, RMDR1 and RTR bits of the M_CTRLm register (refer to Table 14-15).
The remote frame reception in a transmit message buffer causes a reaction according to the set-
ting of the RMDE0, RMDR1 bits and the RTR bit of the M_CTRLm register. The following reac-
tions are programmable:
• Generation of an auto-answer (i.e. TRQ bit of the transmit message buffer is automatically set
without any CPU interaction).
• Signalling the remote frame reception by updating the DN flag in the transmit message buffer.
• No reaction at all.
Table 14-15 shows the detailed handling (reaction) upon the reception of a remote frame for a
transmit message buffer depending on the settings of RMDE0, RMDE1 and RTR flags.
Table 14-15:
Remote Frame Handling upon Reception into a Transmit Message Buffer
Note: Auto-answer upon remote frame is suppressed, because the transmit message buffer is config-
ured to send a remote frame (RTR = 1).
Remarks: 1. In case a remote frame is automatically answered upon receiving a remote frame for a
transmit message buffer, the reception of the remote frame is not notified by a receive
interrupt. However, the successful transmission of the data frame (i.e. the automatic
answer) is notified by the corresponding transmit interrupt.
2. m = 00 to 31
M_CTRLm setting
Resulting Automatic Remote Frame Handling
RMDE0
RMDE1
RTR
DN flag
other actions
0
0
x
no change
– („ignore remote frame“)
1
0
0
Clear when transmit message buffer
sent successfully
send transmit message buffer (data
frame) as an automatic answer.
1
no change
–
Note
0
1
x
DN is set upon reception
–
1
1
0
Clear when transmit message buffer
sent successfully
send transmit message buffer (data
frame) as an automatic answer.
1
DN is set upon reception
–
Note
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