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ST20-C1 Datasheet(PDF) 155 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) 155 Page - STMicroelectronics

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8 Instruction Set Reference
®
sub
subtract
Code: F5
Description: Subtract Areg from Breg, with checking for overflow.
Definition:
if (diff > MostPos)
{
Areg
′← diff − 2BitsPerWord
if (Status
′
underflo w ≠ set )
Status
′
overflow
← set
}
else if (diff < MostNeg)
{
Areg
′← diff + 2BitsPerWord
if (Status
′
overflow ≠ set )
Status
′
underflo w ←
set
}
else
{
Areg
′← diff
}
Breg
← Creg
Creg
← Areg
where
diff
= Breg − Areg
– the value of diff is calculated to unlimited precision
Status Register:
Overflow or underflow bit may be set.
Comments:
Secondary instruction.
See also:
add subc
section 4.4.



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