MC9S12C Datasheet, PDF (289/680 Pages) Motorola, Inc – 16-Bit Microcontroller

Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
10.1.4 Modes of Operation
The following modes of operation are specific to the MSCAN. See Section 10.4, “Functional Description,”
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 — CAN Receiver Input Pin
RXCAN is the MSCAN receiver input pin.
10.2.2 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
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 01.23