A microcontroller has 20 bits address bus how much memory sp

A microcontroller has 20 bits address bus, how much memory space does it have?

Solution

-->A microcontroller contains a microprocessor and also one or more of the
   1)Memory
   2)Analog to Digital(A/D)converter
   3)Paraller I/o interface
   4)Serial I/O interface
   5)Timers and Counters
  

-->Given that microcontroller has 20 bit address bus
-->It can read or write data to memory or I/O ports either 16 bit or 8 bit at a time
-->It can address 2^20 memorylocations
-->Thus it can have 2^20 or(1,048,576) memory locations
-->1GB memory space.