參數(shù)資料
型號(hào): μPD70F3008
廠商: NEC Corp.
英文描述: 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
中文描述: 16/32位單片機(jī)微控制器(16/32位單片微控制器)
文件頁數(shù): 27/141頁
文件大?。?/td> 374K
代理商: ΜPD70F3008
15
CHAPTER 3 DATA TYPE
3.2.2 Unsigned integer
While an integer is data that can take either a positive or a negative value, an unsigned integer is an integer that
is not negative. Like an integer, an unsigned integer is also expressed as 2’s complement and is 8, 16, or 32 bits
long. Regardless of its length, the bit 0 of an unsigned integer is the least significant bit, and the higher the bit number,
the more significant the bit. However, no sign bit is used.
Data Length
Range
Byte
8 bits
0 to 255
Half-word
16 bits
0 to 65535
Word
32 bits
0 to 4294967295
3.2.3 Bit
The V850 family can handle 1-bit data that can take a value of 0 (cleared) or 1 (set). Bit manipulation can be
performed only to 1-byte data in the memory space in the following four ways:
Set
Clear
Invert
Test
3.3 Data Alignment
With the V850 family, word data to be allocated in memory must be aligned at an appropriate boundary. Therefore,
word data must be aligned at a word boundary (the lower 2 bits of the address are 0), and half-word data must be
aligned at a half-word boundary (the lowest bit of the address is 0). If data is not aligned at a boundary, the data
is accessed with the lowest bit(s) of the address (lower 2 bits in the case of word data and lowest 1 bit in the case
of half-word data) automatically masked. This will cause lost of data and truncation of the least significant bytes. Byte
data can be placed at any address.
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