HD6413008VF25 Datasheet, PDF (71/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

2. CPU
Data Type
General
Register Data Format
15
0
Word data
Rn
MSB
LSB
15
0
Word data
En
MSB
LSB
31
16 15
0
Longword data ERn
MSB
LSB
Legend:
ERn: General register
En: General register E
Rn: General register R
MSB: Most significant bit
LSB: Least significant bit
Figure 2.7 General Register Data Formats (2)
2.5.2 Memory Data Formats
Figure 2.8 shows the data formats on memory. The H8/300H CPU can access word data and
longword data on memory, but word or longword data must begin at an even address. If an attempt
is made to access word or longword data at an odd address, no address error occurs but the least
significant bit of the address is regarded as 0, so the access starts at the preceding address. This
also applies to instruction fetches.
Rev.4.00 Aug. 20, 2007 Page 25 of 638
REJ09B0395-0400