參數(shù)資料
型號: UPD70741GC-25-8EU
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V821TM 32-/16-BIT MICROPROCESSOR
中文描述: V821TM 32-/16-BIT微處理器
文件頁數(shù): 25/112頁
文件大?。?/td> 605K
代理商: UPD70741GC-25-8EU
μ
PD70741
25
(5) Single-precision floating-point data
This data type is 32 bits long and its bit allocation complies with the IEEE single format. A single-precision floating-
point data consists of 1-bit mantissa sign bit, 8-bit exponent, and 23-bit mantissa. The exponent is offset-
expressed from the bias value - 127, and the mantissa is binary-expressed with the integer part omitted.
3.5.2 Data alignment
In the V821, a word data must be aligned to a word boundary (with the lowest two bits of the address fixed to 0s),
and a halfword data to a halfword boundary (with the lowest bit of the address fixed to 0). If a data is not aligned
as specified, the lowest two bits (in the case of word) or one bit (in the case of halfword) of its address will forcibly
be masked with 0s when the data is accessed.
31
23
30
s
exp (8)
mantissa (23)
22
0
D
A + 8
M - 1
0
A + 4
A (Word boundary)
M
B
Attribute
Upward
Downward
First-word address (0s in bits 1 and 0)
In-word bit offset (0 to 31)
Bit length (0 to 2 - 1)
32
A
B
M
A + 4
D
M
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