Separate 16bit hex data

Hello,

I want to separate 16bit Hex data in groups of 4 bit i.e. if I input ABCD, the output should be A, B, C, D. 

The idea I am thinking of is to do bitwise AND and do masking with 0xf, 0xf0, 0xf00 and 0xf000, but I am not able to implement it.

Please help me regarding this.

Thanks