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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
1-bit data
Byte data
Byte data
Word data
4-bit BCD data
4-bit BCD data
Notation:
RnH:
Upper byte of general register
RnL:
Lower byte of general register
MSB:
Most significant bit
LSB:
Least significant bit
7
RnH
7
6
5
RnL
don't care
7
RnH
MSB
RnL
don't care
15
Rn
MSB
7
RnH
Upper digit
RnL
don't care
Figure 2-3 Register Data Formats
Data Format
0
4
3
2
1
0
0
LSB
4
3
0
Lower digit
18
don't care
7
7
6
5
4
3
don't care
7
MSB
don't care
7
4
3
Upper digit
0
2
1
0
0
LSB
0
LSB
0
Lower digit
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