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UARTUniversal Asynchronous Receiver TransmitterAdvantages of serial communicationTranslates data between serial and parallel Universal The transmission speeds are configurableStart bit - Data - Stop BitSPISerial Peripheral InterfaceSynchronousserial data link named by MotorolaFull duplexmode- Info can travel both directions at same timeFour LinesSCK: Serial Clock (output from master)MOSI: Master Output, Slave Input (Output from master)MISO: Master Input Slave Output(Output from slave)SS: Slave Select

SCLK: serial clock (output from master);MOSI: master output, slave input (output from master)MISO: master input, slave output (output from slave)SS: slave select (active low, output from master)

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SPII2CInter-Integrated CircuitsPatented by NXP ( Formerly Philips)Atmel : TWI Twin Wire InterfaceTwo WiresSCL: Serial ClockSDA: Serial DataNo Slave Selects (SS) Uses AddressingLinescanbepulledlowbyanydevice,andarehighwhenalldevicesreleasethem.

I2C