[PDF] 6809 cpu datasheet

  • What is the difference between 6809 and 6809E?

    The MC6809 and the MC6809E differ primarily on the origin of the quadrature clocks, E and Q. The 6809 receives a singular clock that is 4x the desired rate of E and Q (either through driving a crystal or from an oscillator), and it generates E and Q. The 6809E expects external circuitry to provide E and Q.

  • What are index registers 6809?

    The Index registers X and Y
    The X and Y registers are identical to each other. Using index registers as data pointers almost always involves incrementing or decrementing the index register after or before data fetching. Therefore the 6809 allows auto increment or decrement together with indexed addressing modes.

  • What is the reset vector for 6809?

    The reset vector for 6800 and 6809 processor families is a 16-bit address stored at 0xFFFE and 0xFFFF.
  • The 6809 has 59 instructions, as compared with 78 on the 6800. So far as I can see, the 6809 lacks instructions that the 6800 has, such as aba , eorb and the transfer instructions ( tba , tap and the like).
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