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ST20CX bảng dữ liệu(PDF) 122 Page - STMicroelectronics

tên linh kiện ST20CX
Giải thích chi tiết về linh kiện  Instruction Set Reference Manual
PDF  212 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST20CX bảng dữ liệu(HTML) 122 Page - STMicroelectronics

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lshr
®
122/212
lshr
long shift right
Code: 23 F5
Description: Logical shift right the double word value in Creg and Breg (most
significant word in Creg) by the number of places specified in Areg. This instruction is
only defined if the shift length is less than twice the word length.
Definition:
if (0
≤ Areg < 2 × BitsPerWord)
{
Areg
′← (long >> Areg
unsigned) rem 2
BitsPerWord
Breg
′← ((long >> Areg
unsigned) / 2
BitsPerWord) rem 2BitsPerWord
} else {
Areg
′← undefined
Breg
′← undefined
}
Creg
′← undefined
where long
= (Creg
unsigned × 2
BitsPerWord)
+ Breg
unsigned
–
the value of long is calculated to double word precision
Error signals: none
Comments:
Secondar y instruction.
The behavior for shift lengths outside the stated range is implementation
dependent.
See also:
lshl



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