ST20C2 datasheet(181/212 Pages) STMICROELECTRONICS

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ST20C2 データシート(PDF) 181 Page - STMicroelectronics

部品番号	ST20C2

部品情報	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

メーカー	STMICROELECTRONICS [STMicroelectronics]

ホームページ	http://www.st.com

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181 / 212 page

sulmul

181/212

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.

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