h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 67

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

2.5
The 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
Figure 2.10 shows 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
Data Formats
General Register Data Formats
Figure 2.10 General Register Data Formats
Register Number
RnH
RnL
RnH
RnL
RnH
RnL
Data Format
MSB
7
7
7
7 6 5 4 3 2 1 0
Upper
Don’t care
Don’t care
Don’t care
Rev. 5.00 Sep 22, 2005 page 41 of 1136
4 3
Lower
LSB
0
0
0
MSB
7
7
7
7 6 5 4 3 2 1 0
Upper
Don’t care
Don’t care
Don’t care
REJ09B0257-0500
4 3
Section 2 CPU
Lower
LSB
0
0
0