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M32R-FPU Software Manual (Rev.1.01)

(2) Data format in memory

The data sizes in memory can be byte (8 bits), halfword (16 bits) or word (32 bits).

Although byte data can be located at any address, halfword and word data must be

located at the addresses aligned with a halfword boundary (least significant

address bit = "0") or a word boundary (two low-order address bits = "00"),

respectively. If an attempt is made to access memory data that overlaps the

halfword or word boundary, an address exception occurs.

Address

byte

half

word

+0 address +1 address +2 address +3 address

b0 b31

byte

halfword

word

7 8 15 16 23 24

Figure 1.6.3 Data Format in Memory

CPU PROGRAMMING MODEL

1.6 Data Format

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 193 194

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