unsigned less
unsigned 8-bit integer: uint8
signed 8-bit integer: int8
uint8 range: 0 - 255 (0000 0000 - 1111 1111)
int8 range: -127 - 128
bin uint int
0 0111 1111 127 127
0 1000 0000 128 -128
0 1000 0101 133 -123
133 (9-bit):
0 1000 0101
1 0111 1010 + 1 => 1 0111 1011 (-133)
+__________
1 1111 1111 + 1 => 0 0000 0000
