HD64F3337YCP16V Datasheet, PDF (62/749 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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
1-bit data
7
0
RnH 7 6 5 4 3 2 1 0
Don’t care
1-bit data
RnL
Don’t care
7
0
76543210
Byte data
7
RnH MSB
0
LSB
Don’t care
7
0
Byte data
RnL
Don’t care
MSB
LSB
15
0
Word data
Rn MSB
LSB
4-bit BCD data
RnH
7
4
Upper digit
3
0
Lower digit
Don’t care
4-bit BCD data RnL
Don’t care
7
4
Upper digit
3
0
Lower digit
Legend:
RnH: Upper digit of general register
RnL: Lower digit of general register
MSB: Most significant bit
LSB: Least significant bit
Figure 2.3 Register Data Formats
30