HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 63
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HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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2.3
2.3.1
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.
2.3.2
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.
Data Formats
Data Format in Registers
Data Formats in Memory
Address 2n
Address 4n
31
Figure 2.3 Data Formats in Memory
Figure 2.2 Data Format in Registers
Address m
31
Byte
Word
Address m + 1
Longword
23
Byte
Longword
Address m + 2
15
Rev.4.00 Mar. 27, 2008 Page 19 of 882
Byte
Word
Address m + 3
7
Byte
0
0
REJ09B0108-0400
2. CPU
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