ST20C4 datasheet(153/212 Pages) STMICROELECTRONICS

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ST20C4 Scheda tecnica(PDF) 153 Page - STMicroelectronics

Il numero della parte	ST20C4

Spiegazioni elettronici	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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153 / 212 page

satsub

153/212

satsub

saturating subtract

Code: 26 F9

Description: Perform subtraction using ‘saturating arithmetic’ i.e. signed arithmetic

where overflowing results do not wrap round but return MostPos or MostNeg

according to the sign of the result. This instruction is used for clipping algorithms in

signal processing.

Definition:

if (diff

> MostPos)

Areg

′← MostPos

else if (diff

< MostNeg)

Areg

′← MostNeg

else

Areg

′← diff

Breg

′← Creg

Creg

′← undefined

where diff

= Breg − Areg

– diff

is calculated to unlimited precision

Error signals: none

Comments:

Secondary instruction.

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