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ST20C2 Datasheet(PDF) 104 Page - STMicroelectronics

Part # ST20C2
Description  Instruction Set Reference Manual
PDF  212 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Datasheet(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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