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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
Legend:
RnH: General register (high byte)
RnL: General register (low byte)
MSB: Most significant bit
LSB: Least significant bit
7
RnH
7
6
5
RnL
Don't care
7
RnH
MSB
Don't care
RnL
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
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
15
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