h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 93

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 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
General Register
RnH
RnL
RnH
RnL
RnH
RnL
Data Format
MSB
7
7
7
Upper digit Lower digit
7 6 5 4 3 2 1 0
Don’t care
Don’t care
Don’t care
Rev. 4.00 Jun 06, 2006 page 39 of 1004
4 3
LSB
0
0
0
MSB
7
7
7
Upper digit Lower digit
7 6 5 4 3 2 1 0
Don’t care
Don’t care
Don’t care
REJ09B0301-0400
4 3
Section 2 CPU
LSB
0
0
0