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i2c-hw access for philips style parallel port adapters
Graphical lcd library, you can port to many mcu.
One Port Hide source code。very classic .by Jiurl
class to work with UART port on ATmega128/ATmega2560
Top Level Dual Port Ram Core Project, VHDL code
vhdl code for obtaining video output through vga port
The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion forSMBus an
Universal Serial Bus Usage Tables for HID Power Devices Universal Serial Bus Usage Tables
资料->【B】电子技术->【B5】通信技术->【1】通信协议->【USB、OTG】->Universal Serial Bus Device Class Definition for Printing Devices.pdf
资料->【B】电子技术->【B3】传感测量->【2】遥控遥感->【IR、红外】->IrDA Serial Infrared Physical Layer Measurement Guidelines V1.0.pdf