This reference design describes a Universal Serial Bus Card Reader solution by using the MC9S12UF32. The software was developed under the M68EVB912UF32 evaluation platform board. The firmware source codes are available as reference materials.

The MC9S12UF32 (UF32) microcontroller features an integrated Universal Serial Bus (USB) 2.0 controller and physical layer transceivers to provide comprehensive USB specification implementation for both high-speed (480 Mbps) and full-speed (12 Mbps) operations. The high-speed operation, running at bus speed of 30 MHz, implements fast large data transfers for applications such as real-time movies that were impractical at the previous lower-speed operation. Besides standard USB functionality, the UF32 enables control of external hard disk drives, CD-ROM and DVD-ROM drives. The UF32 also enables controls of different common Flash memory devices including: CompactFlash, Secure Digital, MultiMediaCard, SmartMedia and Memory Stick memory cards.

The UF32 is designed to reduce overall system components count and to improve performance by off-loading peripheral overhead functions from the CPU. The on-board Flash enables the peripheral system to accommodate future software upgrades. The UF32 can be used in card readers for popular Flash memory cards, ATA/ATAPI bridges for external hard disks and DVD ROM, USB Flash disks and digital wallets.