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Word data
Word data
15
MSB
Longword data
31
MSB
Legend
ERn:
General register ER
En:
General register E
Rn:
General register R
RnH:
General register RH
RnL:
General register RL
MSB:
Most significant bit
LSB:
Least significant bit
1.5.2 Memory Data Formats
Figure 1-11 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.
Rn
En
ERn
En
Figure 1-10 General Register Data Formats (cont)
15
MSB
0
LSB
15
16
13
LSB
Rn
LSB
0
0
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