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HD6417618A датащи(PDF) 56 Page - Renesas Technology Corp

номер детали HD6417618A
подробное описание детали  32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
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HD6417618A датащи(HTML) 56 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 6.00 Jun. 12, 2007 Page 24 of 610
REJ09B0131-0600
2.3
Data Formats
2.3.1
Register Data Format
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
register.
Longword
31
0
Figure 2.2 Register Data Format
2.3.2
Memory Data Formats
Memory data formats are classified into byte, word, and longword.
Byte data can be accessed from any address. If word data starting from boundary other than 2n or
longword data starting from a boundary other than 4n is accessed, an address error will occur. In
such cases, the data accessed cannot be guaranteed. See figure 2.3.
Byte 0
Byte 1
Byte 2
Byte 3
Word 0
Word 1
Longword
Big endian
31
23
15
7
Address A + 1
Address A + 4
Address A + 8
Address A
Address A
Address A + 3
Address A + 2
0
Byte 3
Byte 2
Byte 1
Byte 0
Word 1
Word 0
Longword
Little endian
31
23
15
7
Address A + 10
Address A + 4
Address A + 8
Address A + 11
Address A
Address A + 8
Address A + 9
0
Figure 2.3 Memory Data Format
Either big endian and little endian formats can be selected according to the mode pin setting at a
reset. For details on mode pin settings, see section 7, Bus State Controller (BSC).



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