b7 b6 b5 b4 b3 b2 b1 b0
 0  0  0  0  0  0  0  0 = 0
 0  0  0  0  0  0  0  1 = 1 = 1 * 2^0
 0  0  0  0  0  0  1  0 = 2 = 1 * 2^1 + 0 * 2^0
 0  0  0  0  0  0  1  1 = 3 = 1 * 2^1 + 1 * 2^0

 0  0  0  0  1  0  0  0 = 8

 0  0  0  0  0  1  0  0 = 4


 1 byte/8-bit: unsigned: [0, 255]
 1 byte/8-bit: signed:   [-128,127]

 2 bytes: unsigned: [0, 2^16 - 1] [0, 65535]
 2 bytes: signed:   [-2^15, 2^15-1] [-32768, 32767]

----
32.1234567 => 4-byte float