HD6413003RF Datasheet, PDF (43/715 Pages) Renesas Technology Corp – Microcontroller (MCU)

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
General
Register
RnH
RnL
RnH
RnL
RnH
RnL
Data Format
7
0
76543210
Don’t care
Don’t care
7
0
76543210
7 43 0
Upper digit Lower digit
Don’t care
Don’t care
7
43
0
Upper digit Lower digit
7
0
Don’t care
MSB
LSB
7
0
Don’t care
MSB
LSB
Figure 2-6 General Register Data Formats (1)
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