H838602R Datasheet, PDF (45/552 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series

Section 2 CPU
2.3 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.
2.3.1 General Register Data Formats
Figure 2.5 shows the data formats in general registers.
Data Type
1-bit data
1-bit data
General Register
RnH
RnL
4-bit BCD data
RnH
Data Format
7
0
7 6 5 4 3 2 10
Don't care
Don't care
7
0
7 6 5 4 3 2 10
7
43
0
Upper
Lower
Don't care
4-bit BCD data
RnL
Don't care
7
43
0
Upper
Lower
Byte data
Byte data
RnH
RnL
7
MSB
0
Don't care
LSB
7
0
Don't care
MSB
LSB
Figure 2.5 General Register Data Formats (1)
Rev. 3.00 May 15, 2007 Page 13 of 516
REJ09B0152-0300