32172 datasheet(53/875 Pages) RENESAS

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2-8

Rev.1.0

CPU

2.6 Data Formats

2.6.2 Data Formats

(1) Data formats in register

Data sizes in M32R registers are always words (32 bits).

When loading byte (8-bit) or halfword (16-bit) data from memory into a register, the data is sign-

extended (LDB, LDH instructions) or zero-extended (LDUB, LDUH instructions) into word (32-bit)

data before being stored in the register. When storing data from M32R register into memory, the

instruction stores the entire 32-bit data of the register, the STH instruction stores the least

significant 16-bit data, and the STB instruction stores the least significant 8-bit data.

Figure 2.6.2 Data Formats in Register

0(MSB)

31(LSB)

Byte

0(MSB)

31(LSB)

Halfword

0(MSB)

31(LSB)

Word

Sign-extended (LDB instruction) or

zero-extended (LDUB instruction)

From memory (LDB,

LDUB instructions)

0(MSB)

31(LSB)

Byte

0(MSB)

31(LSB)

Halfword

0(MSB)

31(LSB)

Word

To memory (STB instruction)

To memory (STH instruction)

To memory (ST instruction)

From memory (LDH, LDUH instructions)

From memory (LD instructions)

Sign-extended (LDH instruction) or

zero-extended (LDUH instruction)

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