參數(shù)資料
型號(hào)： AN2104
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Using Background Debug Mode for the M68HC12 Family
中文描述： 使用的M68HC12家庭背景調(diào)試模式
文件頁(yè)數(shù)： 1/20頁(yè)
文件大小： 414K
代理商： AN2104
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by AN2104/D
Motorola, Inc., 2001
AN2104
Using Background Debug Mode for the M68HC12 Family
By Timothy J. Airaudi
Applications Engineering, Microcontroller Division
Austin, Texas
Introduction
This application note describes the basic operation of the background
debug mode (BDM) and some of its applications, as it relates to
Motorola’s M68HC12 Family of microcontrollers (MCU). Examples of in-
circuitprogrammingofinternalFLASHmemoryandin-circuitdebugging,
using P&E Microcomputer Systems’ BDM interface cable and its
software, are also contained in this document.
The BDM’s main purpose is to allow debugging of the actual
microcontroller being used in the user’s target application. This takes the
place of hardware such as an in-circuit emulator, which uses external
components to attempt to duplicate operation of the MCU from outside
of the target application.
Instead of having this external hardware, and a variety of potential
problems, the debug logic is built into the MCU’s on-chip integration
module. This differs from other systems that have the debugging logic
located in the central processor unit (CPU). Not having the debugging
logic in the CPU allows for reading and writing of memory locations,
while the CPU is executing user code, with no degradation in real-time
operation. This is an example of the BDM being enabled but not active.
F
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