Address range which can be represented in 20 bit binary data.


                                                   In Binary                                                       In hexadecimal


Minimum possible number   0000 0000 0000 0000 0000                              0000

Maximum possible number 1111 1111 1111 1111 1111                                         FFFF

In c any hexadecimal number statr with 0x 0r 0X

So, address range   will be 0x0000 to 0xFFFF

It is 1MB memory range.


2^10 = 1KB

2^20 = 1MB

2^30 = 1GB  

Where 10, 20, 30 are number of bit.


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