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參數資料
| 型號： | MC68HC705V8 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數： | 1/28頁 |
| 文件大小： | 220K |
| 代理商： | MC68HC705V8 |
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by AN1224/D
SEMICONDUCTOR
TECHNICAL DATA
MOTOROLA
AN1224
MOTOROLA, INC. 1993
AN1224/D
Example Software Routines for the Message Data
Link Controller Module on the MC68HC705V8
By Chuck Powers
Multiplex Applications
INTRODUCTION
The message data link controller (MDLC) module is a serial multiplex communication module designed to
communicate on an automotive serial multiplex bus in a format compatible with the Society of Automotive
Engineers (SAE)
Recommended Practice J1850-Class B Data Communication Network Interface
. The
MDLC communicates using variable pulse width modulation (VPW) bit encoding at a transmission rate of
10.4 kilobits per second (kbps), which is also compatible with General Motors' Class 2 multiplex
communication protocol. The MDLC handles all of the communication duties, including complete message
buffering, bus access, arbitration and error detection. Interrupts of the CPU occur only when a complete
message has been received error-free from the multiplex bus or following a successful transmission onto
the multiplex bus.
This application note describes a basic set of MDLC driver routines for communicating on a Class B serial
multiplex bus using the MC68HC705V8, a multi-purpose microcontroller unit (MCU) based upon
Motorola's industry-standard MC68HC05 CPU. Methods will be outlined for initializing the MDLC for proper
communication, and for transferring data in and out of the MDLC's transmit and receive buffers. Although
these driver routines have been written for use with the MC68HC705V8, the methods described are readily
applicable to any Motorola MC68HC05 or MC68HC08 microcontroller which contains the MDLC module.
J1850 OVERVIEW
The increase in the complexity and number of electronic components in automobiles has caused a
massive increase in the wiring harness requirements for each vehicle. This has resulted in a demand for
ways to reduce the amount of wiring required for communication between various components.
The SAE Recommended Practice J1850 was developed by the Society of Automotive Engineers as a
recommended practice for medium speed (Class B) serial multiplex communication for use in the
automotive environment. The use of serial multiplex communication has given automotive system
designers one method of actually increasing the amount and type of data which can be shared between
various components in the automobile while reducing the amount of wiring necessary to connect these
components. This is done by connecting each component, or node, to a serial bus consisting of either a
single wire or a twisted pair of wires. Each node collects whatever data is useful to itself or other nodes
(wheel speed, engine RPM, oil pressure, etc.), and then transmits this data onto the multiplex bus, where
any other node which needs this data can receive it. This results in a significant improvement in data
sharing while at the same time eliminating the need for redundant sensing systems.
The J1850 protocol encompasses the lowest two layers of the International Standards Organization (ISO)
open system interconnect (OSI) model, the data link layer and the physical layer. It is a multi-master
system, utilizing the concept of carrier sense multiple access with collision resolution (CSMA/CR),
whereby any node can transmit if it has determined the bus to be free. Non-destructive arbitration is
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