MC912DG128A Motorola, MC912DG128A Datasheet - Page 67
MC912DG128A
Manufacturer Part Number
MC912DG128A
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC912DG128A.pdf
(404 pages)
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5-modes
MOTOROLA
EBSWAI — Multiplexed External Bus Interface Module Stops in Wait
Mode
EMK — Emulate Port K
EME — Emulate Port E
the same function as the EMD bit of the non-multiplexed versions of
the HC12 and allows for emulation. Visibility is not available when the
part is operating in a single-chip mode.
Normal modes: write once; Special modes: write anytime EXCEPT
the first time. Read anytime.
This bit controls access to the multiplexed external bus interface
module during wait mode. The module will delay before shutting down
in wait mode to allow for final bus activity to complete.
Normal modes: write anytime; special modes: write never. Read
anytime.
In single-chip mode PORTK and DDRK are always in the map
regardless of the state of this bit.
Normal modes: write once; special modes: write anytime EXCEPT
the first time. Read anytime.
In single-chip mode PORTE and DDRE are always in the map
regardless of the state of this bit.
0 = No visibility of internal bus operations on external bus.
1 = Internal bus operations are visible on external bus.
0 = MEBI continues functioning during wait mode.
1 = MEBI is shut down during wait mode.
0 = Port K and DDRK registers are in the memory map. Memory
1 = In expanded or peripheral mode, PORTK and DDRK are
0 = PORTE and DDRE are in the memory map.
expansion emulation is disabled and all pins are general
purpose I/O.
removed from the internal memory map. Removing the
registers from the map allows the user to emulate the function
of these registers externally.
Operating Modes
MC68HC912DT128A Rev 2.0
Operating Modes
Operating Modes
67
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