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If program the tag of CALL instruction behind FEND instruction, there must be SRET
instruction. If the interrupt pointer program behind FEND instruction, there must be IRET
instruction.
After executing CALL instruction and before executing SRET instruction, if execute FEND
instruction; or execute FEND instruction after executing FOR instruction and before
executing NEXT, an error will occur.
In the condition of using many FEND instructions, please make program or subprogram
between the last FEND instruction and END instruction.
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