SH7080 datasheet(86/1644 Pages) RENESAS

tên linh kiện	SH7080

Giải thích chi tiết về linh kiện	32-Bit RISC Microcomputer SuperH??RISC engine Family

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Section 2 CPU

Rev. 3.00 May 17, 2007 Page 28 of 1582

REJ09B0181-0300

2.3

Data Formats

2.3.1

The size of register operands is always longwords (32 bits). When loading byte (8 bits) or word

(16 bits) data in memory into a register, the data is sign-extended to longword and stored in the

Longword

Figure 2.2 Register Data Format

2.3.2

Memory Data Formats

Memory data formats are classified into bytes, words, and longwords. Byte data can be accessed

from any address. Locate, however, word data at an address 2n, longword data at 4n. Otherwise,

an address error will occur if an attempt is made to access word data starting from an address other

than 2n or longword data starting from an address other than 4n. In such cases, the data accessed

cannot be guaranteed. The hardware stack area, pointed by the hardware stack pointer (SP, R15),

uses only longword data starting from address 4n because this area holds the program counter and

status register.

Byte

Word

Longword

Address m + 1

Address 2n

Address 4n

Address m

Address m + 3

Address m + 2

Figure 2.3 Memory Data Format

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