2026-01-20

2026-01-15 Advanced Embedded Scribe

• TM4C uses harvard architecture
• This allows for parallel instruction and data fetching

Types of Embedded Processors

• Microcontrollers
• ASIC
  • Eg: FPGA
• PLC
• DSP
• GPU

Different buses of ARM Cortex-4M

• ICode

  • Instructions

• System

  • Data

• Dcode

  • Debugging

• Private Peripheral Bus

• Advanced High Performance Bus

  • Things like USB and NVIC

• Uses a RISC ISA

• Instructions are either 16-bit(Thumb) or 32-bit

• It is little endian encoding

• char is ordered as is

• It has 16 general purpose registers

  • Why not more?
    • RISC uses mostly a set instruction encoding scheme
    • Each operand will need a certain number of bits
    • Assume that the instruction is 32 bits
    • For 16 registers we need 4 bits to address
    • For a standard 3 operand instruction, the operands themselves take 12 bits
    • This places a limit on the number of registers