Section 2 CPU
Rev. 6.00 Aug 04, 2006 page 45 of 680
REJ09B0145-0600
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.
7
6
5
4
3
2
1
0
Data Type
Register No.
Data Format
7
0
1-bit data
RnH
7
6
5
4
3
2
1
0
Don't care
7
0
1-bit data
RnL
MSB
LSB
Don't care
Don't care
7
0
Byte data
RnH
Byte data
RnL
Word data
Rn
4-bit BCD data
RnH
4-bit BCD data
RnL
Legend:
RnH:
RnL:
MSB:
LSB:
Upper byte of general register
Lower byte of general register
Most significant bit
Least significant bit
MSB
LSB
Don't care
7
0
MSB
LSB
15
0
Upper digit
Lower digit
Don't care
7
0 3
4
Don't care
Upper digit
Lower digit
7
0 3
4
Figure 2.3 Register Data Formats
Содержание H8/38342
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