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32186 bảng dữ liệu(PDF) 45 Page - Renesas Technology Corp

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32186 bảng dữ liệu(HTML) 45 Page - Renesas Technology Corp

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2
CPU
2-9
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
2.6.2 Data Formats
(1) Data formats in registers
The data sizes in the M32R-FPU 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) to a word (32-bit)
quantity before being loaded in the register.
When storing data from a register into a memory, the 32-bit data, the 16-bit data on the LSB side and
the 8-bit data on the LSB side of the register are stored into memory by the ST, STH and STB instruc-
tions, respectively.
Figure 2.6.2 Data Formats in Registers
Rn
b0
b31
<Load>
Byte
Rn
b0
b31
Halfword
Rn
b0
b31
Word
Sign-extended (LDB instruction) or
zero-extended (LDUB instruction)
From memory
(LDB, LDUB instructions)
<Store>
Rn
b0
b31
Byte
Rn
b0
b31
Halfword
Rn
b0
b31
Word
To memory (STB instruction)
To memory (STH instruction)
To memory (ST instruction)
From memory (LDH, LDUH instructions)
From memory (LD instruction)
Sign-extended (LDH instruction) or
zero-extended (LDUH instruction)
24
16
24
16
2.6 Data Formats



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