HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 38

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

2.5 Data Formats
The H8/300H CPU can process 1-bit, 4-bit (BCD), 8-bit (byte), 16-bit (word), and 32-bit
(longword) data. Bit-manipulation instructions operate on 1-bit data by accessing bit n (n = 0, 1,
2, …, 7) of byte operand data. The DAA and DAS decimal-adjust instructions treat byte data as
two digits of 4-bit BCD data.
2.5.1 General Register Data Formats
Figures 2-6 and 2-7 show the data formats in general registers.
Data Type
1-bit data
1-bit data
4-bit BCD data
4-bit BCD data
Byte data
Byte data
Figure 2-6 General Register Data Formats (1)
General
Register
RnH
RnL
RnH
RnL
RnH
RnL
23
MSB
Data Format
7
7
7
7
Upper digit
6 5 4 3 2 1 0
Don’t care
Don’t care
Don’t care
4 3
Lower digit
LSB
0
0
0
MSB
7
7 6 5 4 3 2 1 0
7
7
Upper digit
Don’t care
Don’t care
Don’t care
4 3
Lower digit
LSB
0
0
0