USB Mass Storage Device Using

USB Mass Storage Device Using a PIC MCU:In recent years, there has been immense growth in
Universal Serial Bus (USB) based applications,
primarily due to the Plug and Play nature of USB.
This application note describes the design and
implementation of a USB Mass Storage Device (MSD)
using a Secure Digital card, which should prove useful
to developers of USB mass storage solutions. This
application may be used as a stand-alone MSD or as a
Secure Digital/Multimedia Card (SD/MMC) reader/
writer interface.
This design consists of the following components:
• USB V2.0 compliant PIC18F4550 microcontroller
• PICDEM™ FS USB Demonstration Board
• PICtail™ Board for SD™ and MMC Cards
• Windows® operating system compatible
(Me, 2000, XP and Windows Server™ 2003)
Figure 1 shows the hardware configuration of the
MSD. The PICtail™ Board for SD™ and MMC Cards (check the Microchip web site for availability) is connected into a socket on the PICDEM™ FS USB Demonstration Board. For additional details, refer to the PICDEM FS USB Demonstration Board User’s Guide (see “References”).