With field value 0b00000000: 
   0b00000000 --> 0b00000000   0b11111111 --> 0b11000111   
With field value 0b00001000: 
   0b00000000 --> 0b00001000   0b11111111 --> 0b11001111   
With field value 0b00100000: 
   0b00000000 --> 0b00100000   0b11111111 --> 0b11100111   
With field value 0b00111000: 
   0b00000000 --> 0b00111000   0b11111111 --> 0b11111111