參數(shù)資料
型號: M32000D3FP
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 66.6 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù): 77/155頁
文件大?。?/td> 1340K
代理商: M32000D3FP
2-8
M32000D3FP User's Manual
CPU
2.6 Data format
2.6.2 Data formats
(1) Data format in a register
Data size of a register of the M32R CPU is always a word (32 bits).
Byte (8 bits) and halfword (16 bits) data in memory are sign-extended (the LDB and LDH instructions)
or zero-extended (the LDUB and LDUH instructions) to 32 bits, and loaded into the register.
Word (32 bits) data in a register is stored to memory by the ST instruction. Halfword (16 bits) data
in the LSB side of a register is stored to memory by the STH instruction. Byte (8 bits) data in the
LSB side of a register is stored to memory by the STB instruction.
Fig. 2.6.2 Data format in a register
Rn
0
31
< load >
byte
Rn
0
31
halfword
Rn
0
31
word
sign-extention (LDB instruction) or
zero-extention (LDUB instruction)
from memory
(LDB, LDUB instruction)
< store >
Rn
0
31
byte
Rn
0
31
halfword
Rn
0
31
word
to memory (STB instruction)
to memory (STH instruction)
to memory (ST instruction)
from memory (LDH, LDUH instruction)
from memory (LD instruction)
24
16
24
16
sign-extention (LDH instruction) or
zero-extention (LDUH instruction)
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