5 data formats, 1 general register data formats, Figure 2.9 general register data formats (1) – Renesas H8S/2111B User Manual
Page 60
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
7
0
4 3
Don't care
Don't care
Don't care
7
0
4 3
7
0
Don't care
6 5 4 3 2
7
1 0
7
0
Don't care
6 5 4 3 2
7
1 0
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)