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DS72011RB120FPV 데이터시트(PDF) 52 Page - Renesas Technology Corp

부품명 DS72011RB120FPV
상세설명  32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series
PDF  1196 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

DS72011RB120FPV 데이터시트(HTML) 52 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 2.00 Sep. 07, 2007 Page 24 of 1164
REJ09B0321-0200
2.2
Data Formats
2.2.1
Data Format in Registers
Register operands are always longwords (32 bits). If the size of memory operand is a byte (8 bits)
or a word (16 bits), it is changed into a longword by expanding the sign-part when loaded into a
register.
31
0
Longword
Figure 2.4 Data Format in Registers
2.2.2
Data Formats in Memory
Memory data formats are classified into bytes, words, and longwords. Memory can be accessed in
8-bit bytes, 16-bit words, or 32-bit longwords. A memory operand of fewer than 32 bits is stored
in a register in sign-extended or zero-extended form.
A word operand should be accessed at a word boundary (an even address of multiple of two bytes:
address 2n), and a longword operand at a longword boundary (an even address of multiple of four
bytes: address 4n). Otherwise, an address error will occur. A byte operand can be accessed at any
address.
Only big-endian byte order can be selected for the data format.
Data formats in memory are shown in figure 2.5.
31
0
15
23
7
Byte
Byte
Byte
Byte
Word
Word
Address 2n
Address 4n
Longword
Address m
Address m + 2
Address m + 1
Address m + 3
Figure 2.5 Data Formats in Memory



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