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Rev. 1.00, 05/04, page 26 of 544
2.5 Data Formats
The H8S/2000 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
Figure 2.9 shows the data formats of general registers.
7
0
7
0
MSB LSB
MSB LSB
704
3
Don't care
Don't care
Don't care
7
04
3
70
Don't care
6543271
0
7
0
Don't care
65432710
Don't care
RnH
RnL
RnH
RnL
RnH
RnL
Data Type Register Number Data Image
Byte data
Byte data
4-bit BCD data
4-bit BCD data
1-bit data
1-bit data
Upper Lower
Upper Lower
Figure 2.9 General Register Data Formats (1)