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Universal Serial Bus, OTG Capable Controller
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 15-3
15.1.2 USB On-The-Go
USB (Universal Serial Bus) is a popular standard for connecting peripherals and portable consumer
electronic devices such as digital cameras and hand-held computers to host PCs. The On-The-Go (OTG)
Supplement to the USB Specification extends USB to peer-to-peer application. Using USB OTG
technology consumer electronics, peripherals and portable devices can connect to each other (for example,
a digital camera can connect directly to a printer, or a keyboard can connect to a Personal Digital Assistant)
to exchange data.
With the USB On-The-Go product, you can develop a fully USB-compliant peripheral device that can also
assume the role of a USB host. Software determines the role of the device based on hardware signals, and
then initializes the device in the appropriate mode of operation (host or peripheral) based on how it is
connected. After connecting the devices can negotiate using the OTG protocols to assume the role of host
or peripheral based on the task to be accomplished.
For additional information, refer to the On-The-Go Supplement to the USB 2.0 Specification [3].
Figure 15-2. Example USB 2.0 On-The-Go Configurations
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