MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 22-33
22.6 Revision History
Table 22-18. Changes to MPC5553/5554 RM for Rev. 4.0 Release
Description of Change
• In the Receive Process, Section 22.4.3, “Receive Process,” in the third step, changed “receive active and empty” to
EMPTY.
• Reworded the first paragraph of Matching Process, Section 22.4.3.1, “Matching Process:”
From: “After a MB is marked as ‘RX active and empty,’ it will participate in the internal matching process, which takes
place every time the receiver receives an error free frame. In this process, all active RX buffers compare their ID value
to the newly received one, and if a match occurs, the frame is transferred (move in) to the first (that is, lowest entry)
matching MB.”
To: “The matching process compares the IDs of all active RX message buffers to newly received frames, so that, if a
match occurs, a newly received frame is transferred (moved in) to the first (that is, lowest entry) matching MB. Only MBs
marked as EMPTY, FULL, or OVERRUN will participate in the internal matching process at the CRC frame field. The
internal matching process takes place every time the receiver receives an error free frame.”
• In Bus Interface, Section 22.4.8, “Bus Interface,” the following NOTE has been added:
“Unused MB space must not be used as general purpose RAM while FlexCAN is transmitting and receiving CAN
frames.”
Table 22-19. Changes to MPC5553/5554 RM for Rev. 5.0 Release
Description of Change
No change for Rev. 5 release.
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