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The microcontroller module used for in the control board shall be of
sufficient computing capability to handle polling of all of the input
hardware (buttons, faders, etc.), driving of the three LCD modules,
and serial communication at 19.2Kbps.
For the prototype, a pre-made Motorola 8MHz MC68HC11 microcontroller
board will act as the embedded processor for the control board. This
board contains an RS232 port, an 8-input A/D converter, an I/O port,
address decoding logic, and contrast adjustment for liquid crystal
displays. Figure 15 shows this microcontroller board.
In a marketed model, a custom microcontroller board would be developed
that includes only the necessary features. However, due to the time
frame of this project, it makes sense to use a pre-manufactured
microcontroller board. While it would certainly have been possible to
develop a microcontroller board, the time spent debugging the
inevitable problems would have significantly taken away from firmware and
Axiom CMM-11A8 single-board computer, used in the mixer unit.
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