Digital Electronics/Data Encoder

Digital Encoder Introduction

Digital Encoder is a Digital Device that uses binary number of n bit to represent a number of base ten . Binary number of n bit is called Binary Coded Decimal (BCD), a coding scheme used in digital to encode informations

If there are two control lines A and B , we can have 4 4-bit-binary-numbers a₃a₂a₁a₀ which can be used to represent a number of base ten from 0 to 3

A	B	a₁	a₀	Decimal Number
0	0	0	0	0
0	1	0	1	1
1	0	1	0	2
1	1	1	1	3

Digital Encoder Types

BCD - Binary Coded Decimal

In order to encode decimal number from 0 - 9 using Binary Coded Decimal Scheme , 10 4-bit-Binary-numbers are used

A	B	a₃	a₂	a₁	a₀	Decimal Number
0	0	0	0	0	0	0
0	1	0	0	0	1	1
1	0	0	0	1	0	2
1	1	0	0	1	1	3
1	1	0	1	0	0	4
1	1	0	1	0	1	5
1	1	0	1	1	0	6
1	1	0	1	1	1	7
1	1	1	0	0	0	8
1	1	1	0	0	1	9

ASCII Code

ASCII stands for American Standard Communication Information Interchange is the first standard introduced in North America for Information exchange . ASCII uses 7 bits Binary numbers to represent information in human language

Number from 0 to 9
Capital A to Z
Common a to z

Code 0x20 (hexadecimal), the space character, denotes the space between words, as produced by the space-bar of a keyboard. The space character is considered an invisible graphic rather than a control character. Codes 0x21 to 0x7E, known as the printable characters, represent letters, digits, punctuation marks, and a few miscellaneous symbols.

Binary	Oct	Dec	Hex	Glyph
010 0000	040	32	20	space
010 0001	041	33	21	!
010 0010	042	34	22	"
010 0011	043	35	23	#
010 0100	044	36	24	$
010 0101	045	37	25	%
010 0110	046	38	26	&
010 0111	047	39	27	'
010 1000	050	40	28	(
010 1001	051	41	29	)
010 1010	052	42	2A	*
010 1011	053	43	2B	+
010 1100	054	44	2C	,
010 1101	055	45	2D	-
010 1110	056	46	2E	.
010 1111	057	47	2F	/
011 0000	060	48	30	0
011 0001	061	49	31	1
011 0010	062	50	32	2
011 0011	063	51	33	3
011 0100	064	52	34	4
011 0101	065	53	35	5
011 0110	066	54	36	6
011 0111	067	55	37	7
011 1000	070	56	38	8
011 1001	071	57	39	9
011 1010	072	58	3A	:
011 1011	073	59	3B	;
011 1100	074	60	3C	<
011 1101	075	61	3D	=
011 1110	076	62	3E	>
011 1111	077	63	3F	?

Binary	Oct	Dec	Hex	Glyph
100 0000	100	64	40	@
100 0001	101	65	41	A
100 0010	102	66	42	B
100 0011	103	67	43	C
100 0100	104	68	44	D
100 0101	105	69	45	E
100 0110	106	70	46	F
100 0111	107	71	47	G
100 1000	110	72	48	H
100 1001	111	73	49	I
100 1010	112	74	4A	J
100 1011	113	75	4B	K
100 1100	114	76	4C	L
100 1101	115	77	4D	M
100 1110	116	78	4E	N
100 1111	117	79	4F	O
101 0000	120	80	50	P
101 0001	121	81	51	Q
101 0010	122	82	52	R
101 0011	123	83	53	S
101 0100	124	84	54	T
101 0101	125	85	55	U
101 0110	126	86	56	V
101 0111	127	87	57	W
101 1000	130	88	58	X
101 1001	131	89	59	Y
101 1010	132	90	5A	Z
101 1011	133	91	5B	[
101 1100	134	92	5C	\
101 1101	135	93	5D	]
101 1110	136	94	5E	^
101 1111	137	95	5F	_

Binary	Oct	Dec	Hex	Glyph
110 0000	140	96	60	`
110 0001	141	97	61	a
110 0010	142	98	62	b
110 0011	143	99	63	c
110 0100	144	100	64	d
110 0101	145	101	65	e
110 0110	146	102	66	f
110 0111	147	103	67	g
110 1000	150	104	68	h
110 1001	151	105	69	i
110 1010	152	106	6A	j
110 1011	153	107	6B	k
110 1100	154	108	6C	l
110 1101	155	109	6D	m
110 1110	156	110	6E	n
110 1111	157	111	6F	o
111 0000	160	112	70	p
111 0001	161	113	71	q
111 0010	162	114	72	r
111 0011	163	115	73	s
111 0100	164	116	74	t
111 0101	165	117	75	u
111 0110	166	118	76	v
111 0111	167	119	77	w
111 1000	170	120	78	x
111 1001	171	121	79	y
111 1010	172	122	7A	z
111 1011	173	123	7B	{
111 1100	174	124	7C	\|
111 1101	175	125	7D	}
111 1110	176	126	7E	~

Reference

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