ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 155

• Manufacturer Part Number: ST20-C1
• Description: Instruction Set Reference Manual
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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