HD6413002 Datasheet, PDF (41/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

Data Type
General
Register Data Format
Word data
Rn
15
0
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
RnH: General register RH
RnL: General register RL
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.
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