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25
Rn
En
ERn
Word data
Word data
Longword data
15
0
MSB
LSB
General
Register
Data Type
Data Format
15
0
MSB
LSB
31
16
MSB
15
0
LSB
Legend:
ERn:
En:
Rn:
MSB:
LSB:
General register
General register E
General register R
Most significant bit
Least significant bit
Figure 2.7 General Register Data Formats
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.
Summary of Contents for H8/3008
Page 1: ...Hitachi 16 Bit Microcomputer H8 3008 Hardware Manual ADE 602 221 Rev 1 0 9 14 00 Hitachi Ltd ...
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