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Description: RETI pops the high- and low-order bytes of the PC successively from the stack, and restores the interrupt
logic to accept additional interrupts at the same priority level as the one just processed. The Stack Pointer
is left decremented by two. No other registers are affected; the PSW is not automatically restored to its
pre-interrupt status. Program execution continues at the resulting address, which is generally the
instruction immediately after the point at which the interrupt request was detected. If a lower- or
same-level interrupt has been pending when the RETI instruction is executed, that one instruction will be
executed before the pending interrupt is processed.
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