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Chapter 3 Instruction Set Architectures

Chapter 3 Instruction Set Architectures. Chapter Outline. Programming Languages Assembly Languages Instruction Set Architecture Design A Relatively Simple ISA ISA of the 8085 microprocessor. Programming Languages. High level languages Assembly languages Machine languages.

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Chapter 3 Instruction Set Architectures

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  1. Chapter 3Instruction Set Architectures

  2. Chapter Outline • Programming Languages • Assembly Languages • Instruction Set Architecture Design • A Relatively Simple ISA • ISA of the 8085 microprocessor

  3. Programming Languages • High level languages • Assembly languages • Machine languages

  4. Compilation Process

  5. Assembly Process

  6. Java Applets

  7. Assembly Language Attributes • Instruction types • Data types • Addressing modes • Instruction formats

  8. Instruction Types • Data transfer • Data operation • Program control

  9. Data Types • Numeric (integer, floating point) • Boolean (true, false) • Character (ASCII, Unicode)

  10. Addressing modes - Direct

  11. Addressing modes - Indirect

  12. Addressing modes - Register Direct

  13. Addressing modes - Register Indirect @ R

  14. Addressing modes - Immediate

  15. Addressing modes - Implicit

  16. Addressing modes - Relative

  17. Addressing modes - Indexed

  18. Instruction Formats • More operands = less instructions • More operands = larger words

  19. 3-operand Instructions

  20. 2-operand Instructions

  21. 1-operand Instructions

  22. 0-operand Instructions

  23. Instruction Set Architecture • Instruction set • Register set • Memory access information

  24. ISA Attributes • Completeness • Orthogonality • Register set design

  25. ISA Requirements • Backward compatibility? • Data types/sizes • Interrupts? • Conditional instructions?

  26. A Relatively Simple ISA - Registers • Accumulator AC • General purpose register R • Flag Z

  27. A Relatively Simple ISA - Instruction Set

  28. A Relatively Simple ISA - Instruction Set (continued)

  29. A Relatively Simple ISA - Instruction Formats

  30. Example Relatively Simple Program

  31. Example Relatively Simple Program Code

  32. Example Relatively Simple Program Trace

  33. A Relatively Simple ISA - Analysis • Completeness • Orthogonality • Register set design

  34. The 8085 ISA - Registers • Accumulator A • General purpose registers B, C, D, E, H, L • Stack pointer SP • Flags S, Z, P, CY, AC

  35. The 8085 ISA - Instruction Set • Data movement instructions

  36. The 8085 ISA - Instruction Set • Data operation instructions

  37. The 8085 ISA - Instruction Set • Program control instructions

  38. The 8085 ISA - Instruction Formats

  39. Example 8085 Program

  40. Example 8085 Program Code

  41. Example 8085 Program Trace

  42. The 8085 ISA - Analysis • Completeness • Orthogonality • Register set design

  43. Summary • Programming Languages • ISA Design

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