ST20-C1 datasheet(127/205 Pages) STMICROELECTRONICS

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ST20-C1 데이터시트(PDF) 127 Page - STMicroelectronics

부품명	ST20-C1

상세설명	Instruction Set Reference Manual

PDF	205 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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127 / 205 page

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8 Instruction Set Reference

mac

multiply accumulate

Code: 21 F2

Description: Multiply Areg and Breg, and add in Creg. The most significant word of

the result is placed in Breg and the least significant in Areg. This can be used in

forming the double length product of Areg and Breg, with Creg as carry in, treating

the Areg and Breg values as signed but Creg as unsigned.

Definition:

Areg

′← low_word (accum64)

Breg

′← high_word (accum64)

Creg

′← Areg

where

accum64

= (Breg × Areg) + Creg

unsigned

–

the value of accum64 is calculated as a 64-bit value

Status Register:

No effect

Comments:

Secondary instruction.

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