8051 Microcontroller questions that are to be prepared before going to Interview

1. Why it can support 64k rom in mcu???
2. AT89S52 variant addtional features?
3. why banking?why all bank registers having same name??
4. What is memory organization?
5. 12clock pulses.each clock pulse usage??states?
6. why  only R0,R1 for internal ram addressing?
7. Adress Latch used in AT89S52?
8. UART Function?
9. ISP and SPI Protocols