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ST20-C1 Datasheet(PDF) 89 Page - STMicroelectronics

Part # ST20-C1
Description  Instruction Set Reference Manual
PDF  205 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 89 Page - STMicroelectronics

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8 Instruction Set Reference
®
add
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.



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