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AN2398/D
Rev. 0, 1/2003
In-Circuit Programming of
FLASH Memory via the
Universal Serial Bus for the
MC68HC908JB8
Application Note
By Derek Lau
Applications Engineering
Microcontroller Division
Hong Kong
This application note describes a method of in-circuit programming of FLASH
memory via the Universal Serial Bus for the MC68HC908JB8.
For detailed specification on MC68HC908JB8 device, please refer to the data
sheet; Freescale order number: MC68HC908JB8/D.
INTRODUCTION
The Freescale MC68HC908JB8 (hereafter referred as JB8) is a member of the
HC08 Family of microcontrollers (MCUs). The features of the JB8 include a
Universal Serial Bus (USB) interface, which makes this MCU suited for
personal computer Human Interface Devices (HID), such as mice and
keyboards.
On the JB8, 8k-bytes of FLASH memory is allocated for the user code, with an
additional 16-bytes for user defined reset and interrupt vectors. A high voltage
supply is not required by the JB8 for FLASH program or erase operations; as it
is generated by an internal charge-pump.
In-circuit programming (ICP) is a process by which the device is programmed
or erased with the device on the final circuit board — the target system. This
allows the user code to be changed without having to remove the device off the
target system for reprogramming; simplifying user code changes during
product development, last minute changes during production, and code
upgrades after the product is sold.
The following sections in this application note describes a method of
implementing ICP using the USB as the communication link between host (PC)
and HID.
Freescale Semiconductor, I
For More Information On This Product,
Go to: www.freescale.com
nc
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Freescale Semiconductor
© Freescale Semiconductor, Inc., 2004. All rights reserved.
Verzeichnis
- ・ Technische Daten on Seite 14
- ・ Anwendungsbereich on Seite 1
