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2.3.1
Data Formats in General Registers
Data of all the sizes above can be stored in general registers as shown in figure 2-3.
Data Type
Register No.
1-bit data
RnH
1-bit data
RnL
Byte data
RnH
Byte data
RnL
Word data
Rn
4-bit BCD data
RnH
4-bit BCD data
RnL
Notation:
RnH:
Upper byte of general register
RnL:
Lower byte of general register
MSB:
Most significant bit
LSB:
Least significant bit
18
7
7
6
5
4
3
don't care
7
MSB
don't care
15
MSB
7
4
3
Upper digit
don't care
Figure 2-3 Register Data Formats
Data Format
0
2
1
0
7
7
6
0
LSB
7
MSB
0
Lower digit
7
Upper digit
don't care
5
4
3
2
1
don't care
LSB
LSB
don't care
4
3
Lower digit
0
0
0
0
0
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