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2
(2) Data formats in memory
Data sizes in memory are either byte (8 bits), halfword (16 bits), or word (32 bits). Byte data can
be located at any address. However, halfword data must be located at halfword boundaries
(where the LSB address bit = "0"), and word data must be located at word boundaries (where two
LSB address bits = "00"). If an attempt is made to access memory data across these halfword or
word boundaries, an address exception is generated.
Byte
Halfword
Word
Figure 2.6.3 Data Formats in Memory
+ 0 address + 1 address + 2 address + 3 address
0
7 8
Byte
Byte
(MSB)
Halfword
(MSB)
2-9
Address
15 16
23 24
Byte
(LSB)
Halfword
Word
CPU
2.6 Data Formats
31
Byte
(LSB)
Ver.0.10
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