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© Motorola, Inc., 2002
AN2317/D
Rev. 1, 10/2002
Low-Cost Programming and
Debugging Options for
M68HC08 MCUs
Application Note
By: John Suchyta
Applications Engineering
8/16-Bit Products Division
Introduction
This application note describes several low-cost ways to get a target
M68HC908 microcontroller (MCU) into monitor mode for the purposes of
programming FLASH memory, reprogramming, and debugging. In most cases
an external connector is used to bring the necessary signals from a host
computer to the M68HC908 mounted on the target board. The size and type of
external connector can be tailored to the needs of the application.
Considerations for successful implementation of the monitor mode interface in
a production product are discussed. This application note applies to all
FLASH-based M68HC08 MCUs in general, and to the MC68HC908QY/QT
Family in two particular examples. Note that “FLASH-based M68HC08” and
“M68HC908” are synonymous in this document.
Commercial products, such as Motorola’s line of in-circuit simulator (ICS) kits
and the MON08-Cyclone and MON08-Multilink from P&E Microcomputer
Systems, are available to provide the external connector (typically called the
MON08 interface) and software to develop an application. These products are
recommended for many users, but low-cost alternatives are also available.
These alternatives can be used with several free or low-cost software
packages to develop and program an application.
Commercial products that gang program FLASH MCUs before they are
installed on a printed circuit board are not discussed here since the topic of this
document concerns in-circuit programming. However, commercial
programmers should be considered when the physical means to program in a
production environment are not available.
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