Section 2 Programming Model
Rev.1.00 Dec. 13, 2005 Page 48 of 1286
REJ09B0158-0100
2.5
Data Formats in Memory
Memory data formats are classified into bytes, words, and longwords. Memory can be accessed in
an 8-bit byte, 16-bit word, or 32-bit longword form. A memory operand less than 32 bits in length
is sign-extended before being loaded into a register.
A word operand must be accessed starting from a word boundary (even address of a 2-byte unit:
address 2n), and a longword operand starting from a longword boundary (even address of a 4-byte
unit: address 4n). An address error will result if this rule is not observed. A byte operand can be
accessed from any address.
Big endian or little endian byte order can be selected for the data format. The endian should be set
with the external pin after a power-on reset. The endian cannot be changed dynamically. Bit
positions are numbered left to right from most-significant to least-significant. Thus, in a 32-bit
longword, the leftmost bit, bit 31, is the most significant bit and the rightmost bit, bit 0, is the least
significant bit.
The data format in memory is shown in figure 2.7.
Address A
A
7
0 7
0 7
0 7
0
31
15
0 15
0
31
0
15
0
31
0
23
15
7
0
A + 1
A + 2
A + 3
Byte 0
Word 0
Longword
Word 1
Byte 1 Byte 2 Byte 3
A + 11
7
0 7
0 7
0 7
0
31
15
0
23
15
7
0
A + 10 A + 9
A + 8
Byte 3
Word 1
Longword
Word 0
Byte 2 Byte 1 Byte 0
Address A + 4
Address A + 8
Address A + 8
Address A + 4
Address A
Big endian
Little endian
Figure 2.7 Data Formats in Memory
For the 64-bit data format, see figure 2.5.
Содержание SH7780 Series
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