MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 585

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

16.3 TouCAN Architecture
16.3.1 TX/RX Message Buffer Structure
MPC555
USER’S MANUAL
Each CAN station is connected physically to the CAN bus through a transceiver. The
transceiver provides the transmit drive, waveshaping, and receive/compare functions
required for communicating on the CAN bus. It can also provide protection against
damage to the TouCAN caused by a defective CAN bus or a defective CAN station.
The TouCAN module uses a flexible design that allows each of its 16 message buffers
to be designated either a transmit (Tx) buffer or a receive (Rx) buffer. In addition, to
reduce the CPU overhead required for message handling, each message buffer is as-
signed an interrupt flag bit to indicate that the transmission or reception completed
successfully.
Figure 16-3
displays the standard (11-bit) ID message buffer structure.
/
CNTX0
1. In the MPC555, the CNTX1 and CNRX1 signals are not available.
MPC556
TRANSCEIVER
CNTX1
CONTROLLER
CAN SYSTEM
CAN STATION 1
(TouCAN)
displays the extended (29-bit) ID message buffer structure.
CAN
1
CNRX0
CNRX1
Figure 16-2 Typical CAN Network
CAN 2.0B CONTROLLER MODULE
1
CAN STATION 2
Rev. 15 October 2000
……
CAN STATION n
Figure 16-4
MOTOROLA
16-3