Data Formats In General Registers - Renesas H8 Series Hardware Manual

Section 2 CPU
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: Upper byte of general register
RnL: Lower byte of general register
MSB: Most significant bit
LSB: Least significant bit
Rev. 7.00 Mar 10, 2005 page 30 of 652
REJ09B0042-0700
7
RnH 7 6 5 4
RnL Don't care
7
RnH
MSB
RnL Don't care
15
Rn
MSB
7 4
RnH Upper digit
RnL Don't care
Figure 2.3 Register Data Formats
Data Format
0
3 2 1 0
7
7 6
0
LSB
7
MSB
3 0
Lower digit
7
Upper digit
Don't care
0
5 4 3 2 1 0
Don't care
0
LSB
0
LSB
Don't care
4 3 0
Lower digit