Syntax: SBC {<cond>}{S} <destination>, <operand1>, <operand2>
Operation: destination = operand one - operand two - not (carry)
Flags: N,Z,C,V
This operation allows multi-word subtraction to be performed in the same way that ADC allows multi-word addition. This time the carry flag is used to indicate that a "borrow" occured when subtracting two words.
SBC can be used for multi-word subtractions as follows:
SUBS result_low, low1, low2 ; Subtract low words
SBCS result_high, high1, high2 ; Subtract high words + carry
The S suffix is used to allow the subtract instructions to affect the carry flag.
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