Overview Of Usb Function - Fujitsu MB90335 Series Hardware Manual

16-bit microcontroller
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CHAPTER 11 USB FUNCTION

11.1 Overview of USB Function

11.1
Overview of USB Function
The USB Function is an interface that supports the USB (Universal Serial Bus)
communication protocol. It operates supporting the transfer speed of FULL (12 Mbps)
and has the following characteristics.
■ Features of USB Function
• FULL speed (12 Mbps) is supported. (Correspond to USB Full Speed)
• The device status is auto-answer.
• Bit string, bit stuffing, and automatic generation and check of CRC5 and CRC16
• Toggle check by data synchronization bit
• Automatic response to all standard commands except Get/SetDescriptor and SynchFrame commands
(these three commands can be processed the same way as the class vendor commands.)
• The class vendor commands can be received as data and responded via firmware.
• Support up to six EndPoints (EndPoint0 is fixed to control transfer.)
• 2 built-in transfer data buffers for each EndPoint (each of two built-in buffers dedicated to IN and OUT,
respectively, for EndPoint0)
• Support automatic transfer mode for transfer data via DMA (except buffers for EndPoint0)
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FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
CM44-10137-6E

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