Integer Data Items. 

00h ~ 000-00000b ~ positive integer type (0) value 0
01h ~ 000-00001b ~ positive integer type (0) value 1
17h ~ 000-10111b ~ positive integer type (0) value 23

18h ~ 000-11000b ~ positive integer type (0) value in next byte (24)
18h              ~ value 24 (18h)
18h ~ 000-11000b ~ positive integer type (0) value in next byte (24)
19h              ~ value 25 (19h)

19h ~ 000-11001b ~ positive integer type (0) value in next two bytes (25)
01h 00h          ~ value 256 (big endian)

1Ah ~ 000-11010b ~ positive integer type (0) value in next four bytes (26)
00h 01h 00h 00h  ~ value 65536 (big endian)

20h ~ 001-00000b ~ negative integer type (1) value -1
21h ~ 001-00001b ~ negative integer type (1) value -2

38h ~ 001-11000b ~ negative integer type (1) value in next byte (24)
FFh              ~ value -256