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ST20C4 Datenblatt(PDF) 181 Page - STMicroelectronics

Teilenummer ST20C4
Bauteilbeschribung  Instruction Set Reference Manual
PDF  212 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C4 Datenblatt(HTML) 181 Page - STMicroelectronics

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sulmul
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®
sulmul
signed times unsigned long multiply
Code: 26 F5
Description: Perform signed long multiplication. This instruction forms the double
length product of Areg and Breg, with Creg as carry in, treating the initial value Areg
as signed and Breg as unsigned.
Definition:
Areg
′
unsigned
← prod rem 2BitsPerWord
Breg
′← prod / 2BitsPerWord
Creg
′← undefined
where prod
= (Breg
unsigned × Areg) + Cregunsigned
–
the value of prod is calculated to unlimited precision
Error signals: none
Comments:
Secondary instruction.
See also:
lmul slmul



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