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2.5
Data Formats
The CPU can process 1-bit, 4-bit (BCD), 8-bit (byte), 16-bit (word), and 32-bit (longword) data. Bit-manipulation
instructions operate on 1-bit data by accessing bit n (n = 0, 1, 2, …, 7) of byte operand data. The DAA and DAS decimal-
adjust instructions treat byte data as two digits of 4-bit BCD data.
2.5.1
General Register Data Formats
Figure 2-7 shows the data formats in general registers.
7 6 5 4 3 2 1 0
Don’t care
7
0
Don’t care
7 6 5 4 3 2 1 0
4 3
7
0
7
0
Don’t care
Upper
Lower
LSB
MSB
LSB
Data Type
Register Number
Data Format
1-bit data
1-bit data
4-bit BCD data
4-bit BCD data
Byte data
Byte data
RnH
RnL
RnH
RnL
RnH
RnL
MSB
Don’t care
Upper
Lower
4 3
7
0
Don’t care
7
0
Don’t care
7
0
Figure 2-7 General Register Data Formats
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