I2C, microcontroller development, a smart card used most often within the communications protocols, generally easy to understand, this is the Chinese version

Packet : 25811247usb_20.zip filelist
usb_20/
usb_20.pdf
usb_20/2002_05_28_errata.pdf
usb_20/ecn1-usb20-miniB-revd.pdf
usb_20/errata-092800-1207001.pdf
usb_20/InterfaceAssociationDescriptor_ecn.pdf
usb_20/OTG1_0a.pdf
usb_20/OTG1_0a_changebar.pdf
usb_20/OTG_Errata_Update_1.0.pdf
usb_20/resistor_ecn.pdf
usb_20/rnd_chmfr_ECNFINAL.pdf
usb_20/usb_20.pdf

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