Freescale Semiconductor, Inc.
MSCAN Controller
Message Storage
CAN station 1
CAN system
CAN station 2
.....
CAN station n
msCAN12
Controller
TxCAN RxCAN
Transceiver
CAN
Figure 17-1. The CAN System
17.4 Message Storage
msCAN12 facilitates a sophisticated message storage system which
addresses the requirements of a broad range of network applications.
17.4.1 Background
Modern application layer software is built upon two fundamental
assumptions:
1. Any CAN node is able to send out a stream of scheduled
messages without releasing the bus between two messages.
Such nodes will arbitrate for the bus right after sending the
previous message and will only release the bus when arbitration
is lost.
2. The internal message queue within any CAN node is organized
such that if more than one message is ready to be sent, the
highest priority message will be sent out first.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
MSCAN Controller
279
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