ST20-C1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST20-C1' PDF : 205 Pages View PDF
8 Instruction Set Reference
add
Code: F4
Description: Add Areg and Breg.
Definition:
if (sum > MostPos)
{
Areg′ ← sum − 2BitsPerWord
if (Status′underflo w ≠ set )
Status′overflow ← set
}
else if (sum < MostNeg)
{
Areg′ ← sum + 2BitsPerWord
if (Status′overflow ≠ set )
Status′underflo w ← set
}
else
{
Areg′ ← sum
}
Breg′ ← Creg
Creg′ ← Areg
where
sum = Areg + Breg
– the value of sum is calculated to unlimited precision
Status Register:
Overflow or underflow bit may be set.
Comments:
Secondary instruction.
See also: adc addc
section 4.4.
add
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