Maintenance script: Initial automated import

2016-02-05T22:37:45Z

Initial automated import

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Sum of second operand and carry flag is subtracted from the first operand. Results are written into the first operand.

== Syntax ==



sbc a,op8 ;8 bits
sbc hl,op16 ;16 bits

=== Allowed Instructions ===



sbc a,a
sbc a,b
sbc a,c
sbc a,d
sbc a,e
sbc a,h
sbc a,l
sbc a,ixh
sbc a,ixl
sbc a,iyh
sbc a,iyl
sbc a,(hl)
sbc a,(ix+n)
sbc a,(iy+n)
sbc a,n ;8 bits

sbc hl,bc
sbc hl,de
sbc hl,hl
sbc hl,sp

== Effects ==


N flag is set, P/V detects overflow, rest modified by definition.

In the case of 16-bit registers, h flag is undefined.

== Uses ==

Multiple precision subtraction

== T-States ==
r denotes 8-bit register.
rr represents a two byte register pair: BC, DE, HL, SP
{| class="wikitable"
| r || 4
|-
| X || 7
|-
| (hl) || 7
|-
| (ix+X) || 19
|-
| (iy+X) || 19
|-
| hl, rr || 15
|}

== See Also ==


[[Z80:Opcodes:ADC|ADC]],[[Z80:Opcodes:ADD|ADD]],[[Z80:Opcodes:DAA|DAA]],[[Z80:Opcodes:DEC|DEC]],[[Z80:Opcodes:INC|INC]],[[Z80:Opcodes:SUB|SUB]]

{{lowercase}}
[[Category:Z80 Assembly]]
[[Category:Z80 Heaven]]
[[Category:Z80 Opcodes]]

Z80:Opcodes:SBC - Revision history

Maintenance script: Initial automated import