utsav wrote
while specifying RAM address eg. 16384 (0x4000), what does the expression in bracket ie."(0x4000)" mean ?
That's the hexadecimal (base-16) equivalent of the decimal number. Hexadecimal is a convenient shorthand because it is easy to convert between hex and binary by simply replacing the hex digits one at a time with the equivalent 4 binary bits.
HEX BIN HEX BIN HEX BIN HEX BIN
0 0000 4 0100 8 1000 C 1100
1 0001 5 0101 9 1001 D 1101
2 0010 6 0110 A 1010 E 1110
3 0011 7 0111 B 1011 F 1111
So 0x4000 is 0100000000000000 binary. Going the other way, 0110101010000011 would be 0x6A83.
Hexadecimal is sometimes written with a trailing 'H' or 'h' instead of leading '0x': 6A83h.
--Mark
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