Overview
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 20-1
Chapter 20 Byte Data Link Controller (BDLC)

20.1 Overview

The BDLC module is a serial communication module which allows the user to send and receive messages across a Society of Automotive
Engineers (SAE) J1850 serial communication network. The user’s software handles each transmitted or received message on a byte-by-byte
basis, while the BDLC performs all of the network access, arbitration, message framing and error detection duties.
It is recommended that the reader be familiar with the operation and requirements of the SAE J1850 protocol as described in the document
“SAE Standard J1850 Class B Data Communications Network Interface” prior to proceeding with this specification.
The BDLC module is designed in a modular structure for use as an IP block. A general working knowledge of the IP bus signals and bus
control is assumed in the writing of this document.

20.2 Features

Features of the BDLC module include the following:
SAE J1850 Class B Data Communications Network Interface Compatible and ISO Compatible for Low-Speed (125Kbps) Serial
Data Communications in Automotive Applications
10.4 Kbps Variable Pulse Width (VPW) Bit Format
Digital Noise Filter
Digital Loopback Mode
4X Receive and Transmit Mode, 41.6 Kbps, Supported
BREAK symbol generation Supported
Block Mode Receive and Transmit Supported
Collision Detection
Hardware Cyclical Redundancy Check (CRC) Generation and Checking
Dedicated Register for Symbol Timing Adjustments
IP bus Interface
In-Frame Response (IFR) Types 0, 1, 2, and 3 Supported
Polling and CPU Interrupt Generation with Vector Lookup Available

20.3 Modes of Operation

The BDLC module has 6 main modes of operation which interact with the power supplies, pins, and the rest of the MCU as shown below.