DS18b20 displays temperature in steps of 0.5 degrees celius

No matter which code I use, I always get the temperature in steps of 0.5 degrees celsius. I would like to get the temperature in steps of 0.1 degrees. I have connected the GND to GND, signal to pin7, VCC to 5V and a pull-up resistor of 4K7 on the signal wire.

Could someone tell me what I am doing wrong?

Resolution can be set to:

12 bit 1/16 degree C
11 " 1/8 " "
10 " 1/4 " "
9 " 1/2 " "

Please post your code between [code] and [/code] tags.