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Chapter 16
FCAN Controller
User’s Manual U16702EE3V2UD00
Figure 16-49:
Setting Transmission Request (TRQ) to Transmit Message Buffer
After Redefinition
Cautions: 1. When a message is received, reception filtering is performed in accordance with
the ID and mask set to each receive message buffer. If the procedure in the Figure
16-60, “Message Buffer Redefinition,” on page 663 is not observed, the contents
of the message buffer after it has been redefined may contradict the result of
reception (result of reception filtering). If this happens, check that the ID and IDE
received first and stored in the message buffer following redefinition are those
stored after the message buffer has been redefined. If no ID and IDE are stored
after redefinition, redefine the message buffer again.
2. When a message is transmitted, the transmission priority is checked in accor-
dance with the ID, IDE, and RTR bits set to each transmit message buffer to which
a transmission request was set. The transmit message buffer having the highest
priority is selected for transmission. If the procedure in Figure 16-49 is not
observed, a message with an ID not having the highest priority may be transmit-
ted after redefinition.
16.8.4 Transition from initialization mode to operation mode
The CAN module can be switched to the following operation modes.
•
Normal operation mode
•
Normal operation mode with ABT
•
Receive-only mode
•
Single-shot mode
•
Self-test mode
Execute
transmission?
Wait for 1 bit of CAN data.
Set TRQ bit
Set TRQ bit = 1
Clear TRQ bit = 0
Yes
No
Redefinition completed
END
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