SH7785 datasheet(70/1692 Pages) RENESAS

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2. Programming Model

Rev.1.00 Jan. 10, 2008 Page 40 of 1658

REJ09B0261-0100

2.4

Data Formats in Registers

or a word (16 bits), it is sign-extended into a longword when loaded into a register.

Figure 2.6 Formats of Byte Data and Word Data in Register

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.

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