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INT
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Software interrupt
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INT
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INTerrupt
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[Syntax]
INT src
[Operation]
tmp0 = PSW;
U = 0;
I = 0;
PM = 0;
tmp1 = PC + 3;
PC = *(IntBase + src * 4);
SP = SP - 4;
*SP = tmp0;
SP = SP - 4;
*SP = tmp1;
[Function]
- | This instruction generates the unconditional trap which corresponds to the number specified as src. |
- | The INT instruction number (src) is in the range 0 ? src ? 255. |
- | This instruction causes a transition to supervisor mode, and clears the PM bit in the PSW to 0. |
- | This instruction clears the U and I bits in the PSW to 0. |
[Instruction Format]
[Flag Change]
- | This instruction does not affect the states of flags. |
- | The state of the PSW before execution of this instruction is preserved on the stack. |
[Description Example]
INT #0