SH7616 datasheet(67/935 Pages) RENESAS

67 / 935 page

Section 2 CPU

Rev. 2.00 Mar 09, 2006 page 41 of 906

REJ09B0292-0200

2.2

Data Formats

2.2.1

Data Format in Registers

longword, then loaded into the register.

Longword

Figure 2.5 Register Data Format

2.2.2

Data Formats in Memory

These formats are classified into bytes, words, and longwords.

Place byte data in any address, word data from 2n addresses, and longword data from 4n

addresses. An address error will occur if accesses are made from any other boundary. In such

cases, the access results cannot be guaranteed. In particular, the stack area referred to by the

hardware stack pointer (SP, R15) stores the program counter (PC) and status register (SR) as

longwords, so establish the hardware stack pointer so that a 4n value will always result.

To enable sharing of the processor accessing memory in little-endian mode and memory, the CS2,

4 space (area 2, 4) has a function that allows access in little-endian mode. The order of byte data

differs between little-endian mode and normal big-endian mode.

Byte

Word

Address 2n

Address 4n

Longword

Address m

Address m + 2

Address m + 1

Address m + 3

Big endian

Byte

Word

Address 2n

Address 4n

Longword

Address m + 3

Address m + 1

Address m + 2

Address m

Little endian

Figure 2.6 Data Formats in Memory

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