32186 datasheet(46/1032 Pages) RENESAS

46 / 1032 page

CPU

2-10

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Bit endian

(H'01)

Byte endian

(H'01234567)

Big endian

Little endian

Note: • Even when bits are arranged in big endian, H'01 is not B'10000000.

H'01

H'23

H'45

H'67

H'45

H'23

H'01

B'0000001

Figure 2.6.4 General Endian System

(2) Data formats 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.

Figure 2.6.3 Data Formats in Memory

(3) Endian

The diagrams below show a general endian system and the endian adopted for the M32R Family

microcomputers.

Address

Byte

Halfword

Word

+0 address

+1 address

+2 address

+3 address

b31

Byte

Halfword

Word

15 16

23 24

b31

2.6 Data Formats

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