Get the first 3 bits of a 4bit Hex number

[dsupriya]

I have a 4 bit Hex number. The first 3 (starting from the LSB at right) bits give me the data and the 4th bit gives me the address.

How do I read the data bits separately?

 

[M!k]

easy in C:
data = hexnumber & 0x07; // mask the lowest 3 bits

your next question will be: "how do I read the address bit?":
address = hexnumber >> 3; // shift the address bit to the lowest position, so address will be 0 or 1