Datasheet

Rev.6.00 Oct.28.2004 page 30 of 1016
REJ09B0138-0600H
2.5 Data Formats
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 General Register Data Formats
Figure 2-7 shows the data formats in general registers.
76543210 Don’t care
70
Don’t care 76543210
43
70
70
Don’t careUpper Lower
LSB
MSB LSB
Data Type Register Number Data Format
1-bit data
1-bit data
4-bit BCD data
4-bit BCD data
Byte data
Byte data
RnH
RnL
RnH
RnL
RnH
RnL
MSB
Don’t care
Upper
Lower
43
70
Don’t care
70
Don’t care
70
Figure 2-7 General Register Data Formats