CSC270 Introduction to the 6811

--D. Thiebaut 09:57, 14 March 2012 (EDT)

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The 6811 HeathKit

The 6811 Processor

Chip

Architecture

The Processor

The Processor and Memory

Execution of an Instruction

LDAA Extended

• The tables below are taken from Section 10 of Motorola's 6811 Technical Data Manual.

Assembly Language Example

• See Bootloader listing, at end of pdf.

References

• The 6811 Processor: references
  • The official Motorola 68HC11A8 Data Sheet. Fairly cryptic...
  • A good tutorial on 6811 assembly language (pdf)
  • A Motorola 6811 Manual. It is a nicely written refresher on many concepts of assembly language applied to the 6811.
    • Check Section 3.2 on addressing modes (inherent, direct, extended, indexed, relative).
    • Get a refresher for the different instruction types (arithmetic, shifts, control, etc) in Section 3.4.
    • The condition code register is covered in Section 3.5. Skip Section 4.
  • M68HC11 Technical Reference, from Motorola.
    • Section 6.5 shows the instructions in logical groups.
• M68HC11 Pocket Reference.
  • Very useful, on Page 15, a list of all the opcodes supported by the 6811, in numerical (hex) order.
• 68HC11A8 Technical Reference: a hardware & engineering description. of the 6811, its ports, and how it operates.
  • • See Section 10 for a cycle-by-cycle description of the execution of each instruction.
    • See Appendix A, Figure A-14 for the timing diagram of a typical (multiplexed expansion) memory access.
• 6811 Instruction Set, with hexadecimal opcodes. A reverse map, from hex to instructions can be found here.
• 2-Page List of all the 6811 Instructions
• Software for the 6811
• Heathkit ETW3800 Trainer manual (pdf)