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SBC (Super FX)

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Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
Implied (type 1) 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

Example

Let:

Sreg : R4
Dreg : R6
R4 = 5682h
R5 = 3609h
CY = 1

After executing SBC R5:

R6 = 2079h
CY = 0

See Also

Reference