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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
Legend:
RnH:
Upper byte of general register
RnL:
Lower byte of general register
MSB:
Most significant bit
LSB:
Least significant bit
7
0
7
6
5
4
3
Don't care
7
0
MSB
Don't care
15
MSB
7
4
0 3
Upper digit
Don't care
Figure 2.3 Register Data Formats
Data Format
2
1
0
7
7
6
LSB
7
MSB
Lower digit
7
Upper digit
Rev. 6.00 Aug 04, 2006 page 45 of 680
Section 2 CPU
Don't care
0
5
4
3
2
1
Don't care
0
LSB
LSB
Don't care
4
0 3
Lower digit
REJ09B0145-0600
0
0
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