Which 2 Ports Combine To Form The 16 Bit Address For External Memory

1.	Which 2 Ports Combine To Form The 16 Bit Address For External Memory Access?
Answer» Port0 and port2 together form the 16 bit address for external memory. Port0 uses pins 32 to 39 of 8051 to give the LOWER address bits(AD0-AD7) Port2 uses pins 21 to 28 of 8051 to give the higher address bits(A8-A15) This 16 bit address is USED to ACCESS external memory if attached. When connected to external memory they cannot be used as INPUT output ports.

Which 2 Ports Combine To Form The 16 Bit Address For External Memory Access?

Answer»