Motorola USB08 - Manual (Page 59)

USB08 Evaluation Board Designer Reference Manual
MOTOROLA Universal Serial Bus (USB) Interface 59
Designer Reference Manual — USB08 Evaluation Board
Section 4. Universal Serial Bus (USB) Interface
4.1 Contents
4.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.3 Characteristics of the USB08 Reference Design . . . . . . . . . . . 60
4.4 USB Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.5 USB Implementation in the Reference Design . . . . . . . . . . . . . 65
4.5.1 Activation of the USB Module. . . . . . . . . . . . . . . . . . . . . . . .65
4.5.2 Endpoint Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
4.5.3 USB Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
4.6 Device Management with Endpoint 0 . . . . . . . . . . . . . . . . . . . .69
4.6.1 Enumeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.6.2 Assignment of the Device Address . . . . . . . . . . . . . . . . . . .69
4.6.3 Requesting Descriptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.6.4 Device Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.6.5 STALL Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
4.7 Data Communication via Endpoints EP1 and EP2 . . . . . . . . . .75
4.7.1 Receiving Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.7.2 Transmission of Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.8 Host Interaction: Vendor ID and Product ID . . . . . . . . . . . . . . .78
4.9 Windows Device Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.2 Introduction
The universal serial bus (USB) is an interface for the connection of
peripheral devices, for example, printers, scanners, keyboards, and
pointing devices to a PC or a similar host.