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2.4.3 BCD (Binary-coded Decimal)
(1) Definition
BCD is a numeral system that uses four binary bits to represent the decimal digits 0 through 9.
The difference from hexadecimal is that BCD does not use letters A to F.
shows the numeric representations in BIN, BCD, and DEC.
Table2.5
DEC (Decimal)
(2) Numeric representation in BCD
Each register (such as the data register, link register) in the CPU module consists of 16 bits
Therefore, the numeric values can be stored in each register are those in the range between 0 to 9999 in BCD.
2 - 38
Table2.5 Numeric representations in BIN,BCD,and DEC
0
1
2
3
4
5
6
7
8
9
10
11
12
BIN (Binary)
BCD (Binary-coded Decimal)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
0
1
10
11
100
101
110
111
1000
1001
Carry
1
0000
1
0001
1
0010
.
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