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.
Data Format
7
0
1-bit data
RnH
RnL
7
6
5
4
3
2
1
0
don’t care
7
0
1-bit data
don’t care
7
6
5
4
3
2
1
0
7
0
Byte data
RnH MSB
LSB
don’t care
7
0
Byte data
RnL
don’t care
MSB
LSB
15
0
Word data
4-bit BCD data
Rn
MSB
LSB
7
4
3
0
Upper digit
Lower digit
RnH
RnL
don’t care
7
4
3
0
Upper digit
Lower digit
4-bit BCD data
Notation:
don’t care
RnH: Upper byte of general register
RnL: Lower byte of general register
MSB: Most significant bit
LSB: Least significant bit
Figure 2-3 Register Data Formats
20
ETC [ ETC ]
