ST20-C1 datasheet(161/205 Pages) STMICROELECTRONICS

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ST20-C1 Datasheet(PDF) 161 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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161 / 205 page

161/205

8 Instruction Set Reference

umac

unsigned multiply accumulate

Code: 21 F3

Description: Multiply Areg by Breg, adding in Creg, to form a double word result,

treating the initial values as unsigned. This can be used in forming the double length

product of Areg and Breg, with Creg as carry in.

Definition:

Areg

′

unsigned

← low_word (prod)

Breg

′

unsigned

← high_word (prod)

Creg

′← Areg

where prod

= (Breg

unsigned × Aregunsigned) + Cregunsigned

–

the value of prod is calculated to unlimited precision

Status Register:

No effect

Comments:

Secondary instruction.

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