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CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU)
89
Addition in
BCD
Operation
result
Operation
result
Operation
result
Operation
result
Operation
Subtraction in
4-bit binary
Subtraction in
BCD
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1110
1111
1100
1101
1110
1111
1100
1101
1010
1011
1100
1101
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
–16
–15
–14
–13
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1100
1101
1110
1111
1100
1101
1110
1111
1100
1101
1110
1111
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
CY
CY
CY
CY
Addition in 4-
bit binary
Operation
result
11.2.4 Operations in 4-Bit Binary
When the BCD flag is set to 0, arithmetic operations are performed in 4-bit binary.
11.2.5 Operations in BCD
When the BCD flag is set to 1, decimal correction is performed for arithmetic operations performed in 4-bit binary.
Table 11-2 shows the differences in the results of operations performed in 4-bit binary and in BCD. When the result
of an addition after decimal correction is equal to or greater than 20, or the result of a subtraction after decimal
correction is outside of the range –10 to +9, a value of 1010B (0AH) or higher is stored as the result (shaded area
in Table 11-2).
Table 11-2. Results of Arithmetic Operations Performed in 4-Bit Binary and BCD



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