Its scan code is one byte consists of 1-bit release(break) flag at MSB and 7-bit code.
For example 0x29 is sent when 'a' key is pressed and 0xA9 when released.
- MSB LSB
+ MSB LSB
7 6 5 4 3 2 1 0 bit
| | | | | | | |
| +-+-+-+-+-+-+-- scan code(00-7F)