MCF51JM128VQH 用户编程技术手册 - NXP（恩智浦）

1 Introduction

A traditional method of providing in-circuit programming of

an Electronic Control Module (ECM) is based on the

Universal Asynchronous Receiver / Transmitter (UART), or

an MCU-specific interface. Using this approach requires

dedicated hardware on each ECM.

The benefits of utilizing Controller Area Network (CAN) as

an in-circuit programming method can be easily understood.

For systems already using CAN connections, no additional

in-circuit, saving time and effort as well as minimizing the

dependencies between product assembly and software

development. In-field system upgrades, servicing, and

diagnostic reports can be easily achieved using CAN.

For a system that has nodes with identical firmware, it can be

more efficient to upgrade these nodes in a single pass like in

gang-programmer fashion. But when the system has unique

nodes with different firmware, just a single connection to

program the device is considered. In an active network, it is

recommended to shut down all other nodes in order to avoid

CAN Bootloader in the MCF51JM

by:

Xu Weiping and Alejandro Lozano

Automotive and Industrial Solutions Group

© 2012 Freescale Semiconductor, Inc.

Contents

1 Introduction................................................................1

2 Functional description...............................................2

2.1 Functional description of target......................3

2.2 Functional description of USB-to-

bootloader support..................................................10

3.1 Modifying the LCF......................................10

4 Using the bootloader...............................................11

5 Conclusions.............................................................16