For positive temperature
Temp=0.48*CODE(Decimal)
+122.4C:0111 1111 1(BIN)=255(DEC)
Temp=0.48*255=122.4
For negative temperature
Temp=0.48*CODE(Decimal)
-24C:1110 0111 0(BIN) The first bit is sign bit. 1 means negative
invert each bit :0001 1000 1(BIN)
add 1 at last bit: 0001 1001 0(BIN)=50(DEC)
Temp=sign bit(-1)*0.48*50=-24