On-chip support for communication

• Processor may not be fast enough

• Offload standard protocols

• Built-in device drivers

  • for common communication protocols
  • serial-line protocols most common as they require few pins

• e.g. RS-232 serial interface

  • special registers in memory space for interaction

• Increases level of integration

  • pull external devices on-chip
    • must be standard
  • eliminate need for shared memory or system bus

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