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ST20-C1 Datasheet(PDF) 156 Page - STMicroelectronics

No. de pieza ST20-C1
Descripción Electrónicos  Instruction Set Reference Manual
PDF  205 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 156 Page - STMicroelectronics

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®
subc
subtract with carry
Code: 21 F1
Description: Subtract Areg from Breg, unsigned with carry propagation. This
instruction is provided for long arithmetic; address calculations may be performed with
add, sub and adc without affecting the carry flag.
Definition:
if ( diff
≥ 0)
{
Areg
′
unsigned
← diff
Status
′
carry
← clear
}
else
{
Areg
′
unsigned
← diff + 2BitsPerWord
Status
′
carry
← set
}
Breg
′← Creg
Creg
′← Areg
where
diff
= (Breg
unsigned − Aregunsigned) - Statuscarry
– the value of diff is calculated to unlimited precision
Status Register:
Carry bit is set or cleared.
Comments:
Secondar y instruction.
See also:
addc sub
section 4.4.



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