HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 30

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

2.3.1
Data of all the sizes above can be stored in general registers as shown in figure 2.3.
20
1-bit data
1-bit data
Byte data
Byte data
Word data
4-bit BCD data
4-bit BCD data
Legend:
RnH:
RnL:
MSB:
LSB:
Data Type
Upper byte of general register
Lower byte of general register
Most significant bit
Least significant bit
Data Formats in General Registers
Register No.
RnH
RnL
RnH
RnL
Rn
RnH
RnL
MSB
MSB
15
7
Figure 2.3 General Register Data Formats
7
7
7
Upper digit
6
5
don’t care
don’t care
don’t care
4
4
3
3
Lower digit
2
1
Data Format
LSB
0
0
0
0
MSB
7
7
7
7
Upper digit
6
5
don’t care
don’t care
don’t care
4
4
3
3
Lower digit
2
1
LSB
LSB
0
0
0
0
0