Abstract Abs七rac七 The Universal Serial Bus (USB) is specified to be an industry standard extension to the PC architecture. USB is a serial cable bus that supports data exchange between a host computer and a wide range of simultaneously accessible peripherals First, the thesis describes the architecture and features of USB, including the bus attributes, the protocol definition, types of transactions, power management, and so on. It tries to give developers and users a snapshot of USB After that, the thesis will talk about how to develop the USB system, including: device hardware, device software and host software Then the thesis describes some development and technique details of several USB projects: USB tablet, USB univeral development tool, USB security key and USB IsP(In System Program)device. I will give you the details of the hardware and software design of device, including how to write USB device protocol stack, and talk about the kernel drivers and user program in Windows 98 Finally i will talk more about some technique of Motorola microcontroller like isp and so on The thesis is very useful to uSB device implementers and developers These can help them rapidly grasp the main feathers and important place in hardware design, programming of the USB device Key words: USB microcontroller protocol stack device driver ISPAbstract 2 Abstract The Universal Serial Bus USB is specified to be an industry standard extension to the PC architecture. USB is a serial cable bus that supports data exchange between a host computer and a wide range of simultaneously accessible peripherals. First, the thesis describes the architecture and features of USB, including the bus attributes, the protocol definition, types of transactions, power management, and so on. It tries to give developers and users a snapshot of USB. After that, the thesis will talk about how to develop the USB system, including: device hardware, device software and host software. Then the thesis describes some development and technique details of several USB projects: USB tablet, USB univeral development tool, USB security key and USB ISP (In System Program) device. I will give you the details of the hardware and software design of device, including how to write USB device protocol stack, and talk about the kernel drivers and user program in Windows 98. Finally I will talk more about some technique of Motorola microcontroller, like ISP and so on. The thesis is very useful to USB device implementers and developers. These can help them rapidly grasp the main feathers and important place in hardware design, programming of the USB device. Key words: USB microcontroller protocol stack device driver ISP