Datasheet

Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
Freescale Semiconductor MC9S12C-Family / MC9S12GC-Family 289
Rev 01.24
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.
Figure 10-2. CAN System
CAN Bus
CAN Controller
(MSCAN)
Transceiver
CAN node 1
CAN node 2 CAN node n
CAN_L
CAN_H
MCU
TXCAN RXCAN