Get rid of the idea of cache. It's an unnecessary complication to the rest of your question. So assume there is no cache at all. Can you show us where you are stuck? I'd like to see an ALU, memory with address and data, an internal bus, and latches with output enables, for example. How would you do this by hand, for example, if you were the MCU? What would you have to do, playing "computer" on a piece of paper?
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