參數(shù)資料
型號: μPD750100
廠商: NEC Corp.
英文描述: 32 Bit Single Chip Microcontrollers(32位單片微控制器)
中文描述: 32位單片機(jī)微控制器(32位單片微控制器)
文件頁數(shù): 25/66頁
文件大小: 417K
代理商: ΜPD750100
μ
PD705100
25
9.1.1 Integers
In the V830, integers are represented by twos complements. They are expressed by bytes, halfwords, or words.
Digit ordering for integers is as follows: Bit 0 is handled as the least significant bit, regardless of the data length.
Larger bit numbers correspond to higher orders.
Data length
Range (in decimal notation)
Byte (8 bits)
–128 to +127
Halfword (16 bits)
–32 768 to +32 767
Word (32 bits)
–2 147 483 648 to +2 147 483 647
9.1.2 Unsigned integers
Unsigned integers are of a data type for which the most significant bit is not handled as a sign bit, but all bits represent
a positive integer. Data of this data type is represented by a binary number and has a size of a byte, halfword, or
word. Digit ordering for unsigned integers is as follows: Bit 0 is handled as the least significant bit, regardless of the
data length. Larger bit numbers correspond to higher orders.
Data length
Range (in decimal notation)
Byte (8 bits)
0 to 255
Halfword (16 bits)
0 to 65 535
Word (32 bits)
0 to 4 294 967 295
9.2 Data Alignment
The V830 requires that data be aligned with appropriate boundaries: word boundaries for word data, halfword
boundaries for halfword data, and byte boundaries for byte data. If a data alignment error is detected, the data address
is automatically changed to an accessible address. It is impossible to predict whether this address change will lead
to correct or incorrect data access. This change is made as follows:
Data size
Method
Byte data
Halfword data
Bit 0 is masked to 0.
Word data
Bits 0 and 1 are masked to 0.
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