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SUB
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Subtraction without borrow
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SUB
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SUBtract
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[Syntax]
(1)SUB src, dest
(2)SUB src, src2, dest
[Operation]
(1)dest = dest - src;
(2)dest = src2 - src;
[Function]
- | (1)This instruction subtracts src from dest and places the result in dest. |
- | (2)This instruction subtracts src from src2 and places the result in dest. |
[Instruction Format]
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(1)SUB src, dest
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#UIMM:4
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–
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Rd
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Rs
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–
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Rd
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[Rs].memex
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–
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Rd
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dsp:8[Rs].memex
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–
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Rd
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dsp:16[Rs].memex
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–
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Rd
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(2)SUB src, src2, dest
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Rs
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Rs2
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Rd
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[Flag Change]
Conditions
C : The flag is set if an unsigned operation produces no overflow; otherwise it is cleared.
Z : The flag is set if dest is 0 after the operation; otherwise it is cleared.
S : The flag is set if the MSB of dest after the operation is 1; otherwise it is cleared.
O : The flag is set if a signed operation produces an overflow; otherwise it is cleared.
[Description Example]
SUB #15, R2
SUB R1, R2
SUB [R1], R2
SUB 1[R1].B, R2
SUB R1, R2, R3
