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• 2. Microprocessor Design and the ARM
• Approaches to microprocessor design
• Introducing the ARM processor
  • ARM past and present
  • Technical details
• Programming languages
• Assembly language and the ARM
  • Basics of ARM instructions
  • Structure of an ARM Instruction
  • Example ARM Assembly Language Program
  • Types of instructions
  • Arithmetic Operations
  • Logical Operations
  • Register Move Operations

Structure of an ARM Instruction

All ARM instructions conform to the following structural layout:

label <space> opcode <space> operands <space> ; comment

Each field (label, opcode, operands and comment) must be separated by one or more <space> elements. A <space> element can be an actual space character (from your space bar) or a tab.

If there is no label, there must be a <space> element before the actual instruction (i.e. the opcode and any operands.)

The semicolon character indicates the start of a comment, which is terminated by the end of the line.

All sections are optional. Blank lines will be accepted by the assembler, making it easier to improve code clarity.