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Microprocessor/Microcomputer Mode Select. Switches between microprocessor and microcomputer mode.
When high, Zone 7 is enabled on the external interface.
When low, Zone 7 is disabled from the external interface, and on-chip boot ROM may be accessed instead. This signal is latched into the XINTCNF2 register on a reset and the user can modify this bit in software. The state of the XMP/MC pin is ignored after reset.
