XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 264

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

msCAN12 Controller
16.3 Message Storage
16.3.1 Background
Data Sheet
264
msCAN12 facilitates a sophisticated message storage system which addresses
the requirements of a broad range of network applications.
Modern application layer software is built on two fundamental assumptions:
This behavior cannot be achieved with a single transmit buffer. That buffer must be
reloaded right after the previous message has been sent. This loading process
lasts a definite amount of time and has to be completed within the inter-frame
sequence (IFS) to be able to send an uninterrupted stream of messages. Even if
1. Any CAN node is able to send out a stream of scheduled messages without
2. The internal message queue within any CAN node is organized so that the
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
in case of lost arbitration.
highest priority message will be sent out first if more than one message is
ready to be sent.
Figure 16-1. Typical CAN System with msCAN12
CAN SYSTEM
CAN STATION 1
TxCAN
msCAN12 Controller
CONTROLLER
msCAN12
TRANSCEIVER
RxCAN
CAN
CAN STATION 2
M68HC12B Family — Rev. 8.0
. . .
CAN STATION N
MOTOROLA