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MC9S12C_10 Datasheet, PDF (289/690 Pages) Freescale Semiconductor, Inc – Reference Manual | |||
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Chapter 10 Freescaleâs Scalable Controller Area Network (S12MSCANV2)
10.1.4 Modes of Operation
The following modes of operation are speciï¬c to the MSCAN. See Section 10.4, âFunctional Description,â
for details.
⢠Listen-Only Mode
⢠MSCAN Sleep Mode
⢠MSCAN Initialization Mode
⢠MSCAN Power Down Mode
10.2 External Signal Description
The MSCAN uses two external pins:
10.2.1 RXCAN â CAN Receiver Input Pin
RXCAN is the MSCAN receiver input pin.
10.2.2 TXCAN â 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
10.2.3 CAN System
A typical CAN system with MSCAN is shown in Figure 10-2. 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.
CAN node 1
MCU
CAN node 2
CAN node n
CAN Controller
(MSCAN)
TXCAN
RXCAN
Transceiver
CAN_H
CAN_L
CAN Bus
Figure 10-2. CAN System
Freescale Semiconductor
MC9S12C-Family / MC9S12GC-Family
289
Rev 01.24
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