Z86E3016PSG Datasheet, PDF (331/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 CPU
User Manual
313
Subtract With Carry
SBC dst, src
Instruction Format
OPC
OPC
OPC
dst src
src
dst
Cycles
6
6
OPC
(Hex)
32
33
Address
Mode
dst src
r
r
r
lr
dst
10
34
R
R
10
35
R
IR
src
10
36
R
IM
10
37 IR IM
Operation
dst ← dst–src–C
The source operand, along with the setting of the C Flag, is subtracted
from the destination operand and the result is stored in the destination
operand. The contents of the source operand are not affected. Subtraction
is performed by adding the two’s complement of the source operand to
the destination operand. In multiple precision arithmetic, this instruction
permits the carry (borrow) from the subtraction of low order operands to
be subtracted from the subtraction of high order operands.
UM001602-0904
Instruction Description