It does not need random access, so instead of a 23 pin address bus (to randomly access any of 5 million locations), it probably uses a serial interface with one clock line for incrementing an internal address buffer that starts from 0 and counts up through 5MP. Assuming other control line overhead for other functions, there is probably 1 byte transfered per address counter strobe.
And that’s probably why there is a delay after each shot – for a memory transfer from the CCD to the Imaging chip to the flash memory through a narrow pipe.
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