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Miscellaneous instructions
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==========================
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* nop() ``pass`` no operation.
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* wfi() Suspend execution in a low power state until an interrupt occurs.
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* cpsid(flags) set the Priority Mask Register - disable interrupts.
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* cpsie(flags) clear the Priority Mask Register - enable interrupts.
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* mrs(Rd, special_reg) ``Rd = special_reg`` copy a special register to a general register. The special register
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may be IPSR (Interrupt Status Register) or BASEPRI (Base Priority Register). The IPSR provides a means of determining
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the exception number of an interrupt being processed. It contains zero if no interrupt is being processed.
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Currently the ``cpsie()`` and ``cpsid()`` functions are partially implemented.
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They require but ignore the flags argument and serve as a means of enabling and disabling interrupts.
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