ST20-C1 datasheet(162/205 Pages) STMICROELECTRONICS

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ST20-C1 Datasheet(PDF) 162 Page - STMicroelectronics

Part #	ST20-C1

Description	Instruction Set Reference Manual

PDF	205 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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162 / 205 page

162/205

unsign

unsign argument

Code: 21 F9

Description: Remove the sign of the value in Areg and exclusive-or it with a sign flag

in Breg.

Definition:

if (Areg

≥ 0)

{

Areg

′← Breg

Breg

′← Areg

}

else

{

Areg

′← 1 - Breg

Breg

′← − Areg

}

Status Register:

No effect

Comments:

Secondar y instruction

To aid the implementation of signed division.

Breg must be 0 or 1.

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