ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

ladd

ladd

long add

Code: 21 F6

Description: Add with carry in and check for overflow. The result of the operation is

the sum of Areg, Breg and bit 0 of Creg.

Definition:

if (sum > MostPos)

{

Areg′ ← sum − 2BitsPerWord

IntegerOverflow

}

else if (sum < MostNeg)

{

Areg′ ← sum + 2BitsPerWord

IntegerOverflow

}

else

Areg′ ← sum

Breg′ ← undefined

Creg′ ← undefined

where

sum = Areg + Breg + Creg0

– the value of sum is calculated to unlimited precision

Error signals: IntegerOverflow can be signalled.

Comments:

Secondary instruction.

See also: lsum

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