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HD64F2149 Datasheet, PDF (78/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer | |||
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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, â¦, 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 2.10 shows the data formats in general registers.
Data Type
General Register Data Format
1-bit data
RnH
7
0
76543210
Donât care
1-bit data
RnL
Donât care
7
0
76543210
4-bit BCD data
RnH
7
43
0
Upper digit Lower digit
Donât care
4-bit BCD data
RnL
Donât care
7
43
0
Upper digit Lower digit
Byte data
Byte data
RnH
RnL
7
MSB
0
Donât care
LSB
7
0
Donât care
MSB
LSB
Figure 2.10 General Register Data Formats
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