decode - Pin number to Letter

Letter number	dec range start	hex range start	Letter
0	0	0x00	A
1	8	0x08	B
2	16	0x10	C
3	24	0x18	D
4	32	0x20	E
5	40	0x28	F
6	48	0x30	G
7	56	0x38	H
8	64	0x40	I
9	72	0x48	J
10	80	0x50	K
11	88	0x58	L
12	96	0x60	M
13	104	0x68	N
14	112	0x70	O
15	120	0x78	P
16	128	0x80	Q
17	136	0x88	R
18	144	0x90	S
19	152	0x98	T
20	160	0xA0	U
21	168	0xA8	V
22	176	0xB0	W
23	184	0xB8	X
24	192	0xC0	Y
25	200	0xC8	Z
26	208	0xD0	AA
27	216	0xD8	BB
28	224	0xE0	CC
29	232	0xE8	DD
30	240	0xF0	EE