Embedded Systems talk with the outside world via peripherals, such as:

• Serial Communication Interfaces (SCI): RS-232, RS-422, RS-485 etc

• Synchronous Serial Communication Interface: I2C, SPI, SSC and ESSI

(Enhanced Synchronous Serial Interface)

• Universal Serial Bus (USB)

• Multi Media Cards (SD Cards, Compact Flash etc)

• Networks: Ethernet, Controller Area Network, LonWorks, etc

• Timers: PLL(s), Capture/Compare and Time Processing Units

• Discrete IO: aka General Purpose Input/Output (GPIO)

• Analog to Digital/Digital to Analog (ADC/DAC)

• Debugging: JTAG, ISP, ICSP, BDM Port, …

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