[PDF] 6809 instruction set pdf

  • What is the mul instruction in 6809?

    The MC6809 includes a single unsigned multiply instruction (MUL) which multiplies the content of accumulator A by the content of accumulator B and loads the 16-bit product into the double register D (A concatenated with B). It uses the inherent mode and has no other options as to operands or destination.

  • What is the difference between 6309 and 6809?

    The 6309 is fabricated in CMOS technology, while the 6809 is an NMOS device. As a result, the 6309 requires less power to operate than the 6809. The low-power use also means it can be paused for up to 15 cycles as it does not have to constantly refresh its internal state.

  • What is 6809 addressing?

    The 6809 has a very powerful addressing mode called direct page addressing. This way all 256 bytes of any page in memory can be addressed with only 8 bits. These 256 addresses can be considered the "registers" of the 6809
  • The reset vector for 6800 and 6809 processor families is a 16-bit address stored at 0xFFFE and 0xFFFF.
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