If3 Register Set; Message Ram; Data Transfer Between If1 And If2 Registers And Message Ram - Texas Instruments Concerto F28M35 Series Technical Reference Manual

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Figure 23-16. Data Transfer Between IF1 and IF2 Registers and Message RAM
Read message object to IF1/IF2

23.13.2 IF3 Register Set

The IF3 register set can automatically be updated with received message objects without the need to
initiate the transfer from Message RAM by CPU. The automatic update functionality can be programmed
for each message object (see IF3 Update Enable register,
All valid message objects in Message RAM which are configured for automatic update, will be checked for
active NewDat flags. If such a message object is found, it will be transferred to the IF3 register, controlled
by IF3 Observation register. If more than one NewDat flag is active, the message object with the lowest
number has the highest priority for automatic IF3 update.
The NewDat bit in the message object will be reset by a transfer to IF3.
If CAN internal IF3 update is complete, an IF3 interrupt can also be generated.
NOTE: The IF3 register set cannot be used for transferring data into message objects.

23.14 Message RAM

The CAN Message RAM contains message objects and parity bits for the message objects. There are 32
message objects in the Message RAM.
SPRUH22I – April 2012 – Revised November 2019
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START
No
Write message number to command register
Busy = 1
No
WR/RD = 1
Busy = 0
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Message Interface Register Sets
Yes
Yes
Read message object to IF1/IF2
Write IF1/IF2 to message RAM
Section 23.15.24).
M3 Controller Area Network (CAN)
1539