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ST20CX bảng dữ liệu(PDF) 104 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) 104 Page - STMicroelectronics

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ldiv
®
104/212
ldiv
long divide
Code: 21 FA
Description: Divide the double length unsigned integer in Breg and Creg (most
significant word in Creg) by an unsigned integer in Areg. The quotient is put into Areg
and the remainder into Breg. Overflow occurs if either the quotient is not
representable in a single word, or if a division by zero is attempted; the condition for
overflow is equivalent to Cregunsigned ≥ Aregunsigned.
Definition:
if (Cregunsigned ≥ Aregunsigned)
IntegerOverflow
else
{
Areg
′
unsigned
← long / Areg
unsigned
Breg
′
unsigned
← long rem Areg
unsigned
}
Creg
′← undefined
where long
= (Creg
unsigned × 2
BitsPerWord)
+ Breg
unsigned
–
the value of long is calculated to unlimited precision
Error signals:
IntegerOverflow can occur.
Comments:
Secondar y instruction.
See also:
lmul



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