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Communication between modules over USB using a uC

I have a module (say A) which sends data serially to me at 5 Mbps. I want to transfer this data to another module (say B). For B, I have a few choices for links: USB, UART, PCI/E, etc. I am not sure ...
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MCU: saving data directy on flash. What's the advantage?

I know on some MCUs its possible to save data directly on program memory (flash memory). AVRGCC compiler uses "PROGMEM" keyworkd, MPLAB C18 uses a similar one with the same effect. However, what's the ...