ST20C2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20C2

Instruction Set Reference Manual

STMicroelectronics 

sulmul

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

Breg′

← prod rem 2BitsPerWord

← prod / 2BitsPerWord

Creg′

← undefined

where prod = (Bregunsigned × Areg) + Cregunsigned

– the value of prod is calculated to unlimited precision

Error signals: none

Comments:

Secondary instruction.

See also: lmul slmul

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