6809 Assembly Language Programming

Description

Introductory Material Acknowledgements About the Author Contents Program Examples i. Fundamental Concepts 1. Introduction to Assembly Language Programming A Computer Program High-Level Languages 2. Assemblers Features of Assemblers Types of Assemblers Errors Loaders 3. 6809 Machine Structure and Assembly Language 6809 Registers and Flags 6809 Addressing Modes Modes Which Do Not Specify Memory Locations Memory Addressing Modes Indexed Memory Addressing Modes Program Relative Addressing for Branches 6809 Instruction Set 6800/6809 Compatibility 6801/6809 Compatibility 6502/6809 Compatibility Motorola 6809 Assembler Conventions ii. Introductory Problems 4. Beginning Programs Program Examples Problems 5. Simple Program Loops Program Examples Problems 6. Character-Coded Data Handling Data in ASCII Program Examples Problems 7. Code Conversion Program Examples Problems 8. Arithmetic Problems Program Examples Problems 9. Tables and Lists Program Examples Problems iii. Advanced Topics 10. Subroutines Program Examples Position-Independent Code Nested Subroutines Problems 11. Parameter Passing Techniques The PSH and PUL Instructions General Parameter Passing Techniques Types of Parameters 12. Input/Output Considerations I/O Device Categories Time Intervals Logical and Physical Devices Standard Interfaces 6809 Input/Output Chips 13. Using the 6820 Peripheral Interface Adapter (PIA) Initializing a PIA Using the PIA to Transfer Data Program Examples More Complex I/O Devices Problems 14. Using the 6850 Asynchronous Communications Interface Adapter (ACIA) Program Examples 15. Interrupts Characteristics of Interrupt Systems 6809 Interrupt System 6820 PIA Interrupts 6850 ACIA Interrupts 6809 Polling Interrupt Systems 6809 Vectored Interrupt Systems Communications Between Main Program and Service Routines Enabling and Disabling Interrupts Changing Values in the Stack Interrupt Overhead Program Examples More General Service Routines Problems iv. Software Development 16. Problem Definition Inputs Outputs Processing Section Error Handling Human Factors/Operator Interaction Examples Review 17. Program Design Basic Principles Flowcharting Modular Programming Structured Programming Top-Down Design Designing Data Structures Review of Problem Definition and Program Design 18. Documentation Self-Documenting Programs Comments Flowcharts as Documentation Structured Programs and Documentation Memory Maps Parameter and Definition Lists Library Routines Total Documentation 19. Debugging Simple Debugging Tools Advanced Debugging Tools Debugging With Checklists Looking for Errors Examples 20. Testing Selecting Test Data Examples Rules for Testing Conclusions 21. Maintenance and Redesign Saving Memory Saving Execution Time Major Reorganization v. 6809 Instruction Set 22. The Instruction Set Appendices A. Summary of the 6809 Instruction Set B. Summary of the 6809 Indexed and Indirect Addressing Modes C. 6809 Instruction Codes, Memory Requirements, and Execution Times D. 6809 Instruction Object Codes in Numerical Order E. 6809 Post Bytes in Numerical Order Index