USB08 HC908JB8 USB Reference Design

Though the primary target audience of the USB08 Reference Design are Developers of Mikrocontroller Firmware and Hardware, Windows Driver and Application Software issues are also covered by the USB08 Project. USB (Universal Serial Bus) is a standardized bus interface to connect peripheral devices to a Host Computer. Since the build-in USB support o
USB08 HC908JB8 USB Reference Design - schematic

f Win98/Win2k, USB has become available on nearly every new (Windows-based) PC. The USB specification is an industry standard maintained by USB. org, which exactly defines this bus system beginning with the electrical interface up to the higher protocol layers to guarantee the inter-operability of all the different devices. A simple way of handling is the most important requirement for USB devices from the view of the user. Several versions of the USB specification exist. The USB08 Reference Design is based on the already established USB Specification Revision 1. 1 (local copy). The HC908JB8 (more precisly: MC68HC908JB8ADW) is the Microcontroller used for the USB08 Deference Design. It is a low-cost 8-Bit Mikrocontroller from Motorola. It belongs to the HC08 family, one of the most popular microcontroller families used worldwide. Despite the integrated USB interface, the `JB8 has 8KByte internal Flash Memory, which is in-system programmable and erasable. More information about the HC908JB8 can be found on the Motorola Microcontroller Website. Check out the CPU08 Reference Manual, the MC68HC908JB8 Technical Data Book (local copies). Check out the Schematic Diagram of the USB08 Eval Board. A bill of materials as well as the circuit description are included in the USB08 Designer Reference Manual. Two ways of communication are implemented in the demonstration: RS232 and USB. Therefore, a developer experienced with RS232...

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