NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 779 -
Revision V1.30
NUC97
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Figure 5.24-5 Data transfer between IFn Registers and Message
After a partial write of a Message Object, the Message Buffer Registers that are not selected in the
Command Mask Register will set the actual contents of the selected Message Object.
After a partial read of a Message Object, the Message Buffer Registers that are not selected in the
Command Mask Register will be left unchanged.
Message Transmission
5.24.7.4
If the shift register of the CAN Core cell is ready for loading and if there is no data transfer between
the IFn Registers and Message RAM, the MsgVal bits in the Message Valid Register and TxRqst bits
in the Transmission Request Register are evaluated. The valid Message Object with the highest
priority pending transmission request is loaded into the shift register by the Message Handler and the
transmission is started. The NewDat bit of the Message Object is reset.
START
Write Command Request Register
Busy = 1
WR/RD = 1
Read Message Object to IFn
Read Message Object to IFn
Write IFn to Message RAM
Busy = 0
YES
NO