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SBC (Super FX): Difference between revisions

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'''SBC''' (SuBtract with Carry) is a [[Super FX]] instruction that performs a subtraction with regards to the [[CY|carry flag]].
'''SBC''' (SuBtract with Carry) is a [[Super FX]] instruction that performs a subtraction with regards to the [[CY|carry flag]].
Unlike [[ADD (Super FX)]], [[ADC (Super FX)]] and [[SUB (Super FX)]], this one can only be used with registers, not with constant values since since the ALT3 version of SUB is a [[CMP (Super FX)]] instead.
Unlike [[ADD (Super FX)]], [[ADC (Super FX)]] and [[SUB (Super FX)]], this one can only be used with registers, not with constant values since since the ALT3 version of SUB is a [[CMP (Super FX)]] instead.
The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]].  Otherwise, R<sub>0</sub> serves as the default.


==== Syntax ====
==== Syntax ====

Revision as of 18:57, 9 July 2024

Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
3D6n 2 bytes 6 cycles 6 cycles 2 cycle
Flags Affected
B ALT1 ALT2 O/V S CY Z
0 0 0

SBC (SuBtract with Carry) is a Super FX instruction that performs a subtraction with regards to the carry flag. Unlike ADD (Super FX), ADC (Super FX) and SUB (Super FX), this one can only be used with registers, not with constant values since since the ALT3 version of SUB is a CMP (Super FX) instead.

The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R0 serves as the default.

Syntax

SBC Rn

See Also

Reference

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