Writing code

• Machine code

• Assembler

  • macro capability
  • symbolic variables
  • direct access to microcontroller's special features

• Compilers

  • high-level language (C, C++, etc.)
  • escape to assembly language when needed
  • API/header files for special features(I/O ports, special registers, etc.)

• Program loader/linker

  • stores program into ROM/RAM
  • combines multiple programs (e.g., user code with device drivers)

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