Chapter 16 Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
605
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Programmable wakeup functionality with integrated low-pass filter
•
Programmable loopback mode supports self-test operation
•
Programmable listen-only mode for monitoring of CAN bus
•
Programmable bus-off recovery functionality
•
Separate signalling and interrupt capabilities for all CAN receiver and transmitter error states
(warning, error passive, bus-off)
•
Programmable MSCAN clock source either bus clock or oscillator clock
•
Internal timer for time-stamping of received and transmitted messages
•
Three low-power modes: sleep, power down, and MSCAN enable
•
Global initialization of configuration registers
16.1.4
Modes of Operation
The following modes of operation are specific to the MSCAN. See
Section 16.4, “Functional Description
,”
for details.
•
•
•
•
16.2
External Signal Description
The MSCAN uses two external pins:
16.2.1
RXCAN — CAN Receiver Input Pin
RXCAN is the MSCAN receiver input pin.
16.2.2
TXCAN — CAN Transmitter Output Pin
TXCAN is the MSCAN transmitter output pin. The TXCAN output pin represents the logic level on the
CAN bus:
0 = Dominant state
1 = Recessive state
16.2.3
CAN System
A typical CAN system with MSCAN is shown in
. Each CAN station is connected physically
to the CAN bus lines through a transceiver device. The transceiver is capable of driving the large current
needed for the CAN bus and has current protection against defective CAN or defective stations.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages
