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With Cortex-M7 600 MHz as the controller, HD6309E can run at about 1MHz bus clock. At the reset time, the controller determine which MPU is running, MC6809 or HD6309 and change its behavior accordingly. Also the controller can now support native HD6309 mode, which is represented as ā€™Nā€™ between register V and CC.

https://github.com/tgtakaoka/RetroCyborg/tree/main/BionicMC6809E

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