SC9S12XS256J1MAA FREESCALE [Freescale Semiconductor, Inc], SC9S12XS256J1MAA Datasheet - Page 296

• Manufacturer Part Number: SC9S12XS256J1MAA
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale’s Scalable Controller Area Network (S12MSCANV3)
11.2
The MSCAN uses two external pins.
11.2.1
RXCAN is the MSCAN receiver input pin.
11.2.2
TXCAN is the MSCAN transmitter output pin. The TXCAN output pin represents the logic level on the
CAN bus:
11.2.3
A typical CAN system with MSCAN is shown in
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.
296
External Signal Description
0 = Dominant state
1 = Recessive state
RXCAN — CAN Receiver Input Pin
TXCAN — CAN Transmitter Output Pin
CAN System
On MCUs with an integrated CAN physical interface (transceiver) the
MSCAN interface is connected internally to the transceiver interface. In
these cases the external availability of signals TXCAN and RXCAN is
optional.
TXCAN
CANH
CAN Controller
Transceiver
CAN node 1
(MSCAN)
MCU
S12XS Family Reference Manual, Rev. 1.09
CANL
RXCAN
Figure 11-2. CAN System
CAN Bus
NOTE
Figure
CAN node 2
11-2. Each CAN station is connected physically
CAN node n
Freescale Semiconductor