5-12 Computer Group Literature Center Web Site
Functional Description
5
disconnecting power to the board. You can then replace the jumper and
store the board.
The freshness seal protecting the on-board battery is automatically broken
when you apply power to the board with a jumper on J1 pins 1 and 2.
If your application does not use the integrated real-time clock, battery
backup is not needed and the on-board battery can be removed.
Switches and Status Indicators
The MBX board provides for user-installed Abort and Reset switches and
incorporates a number of status signals. The switches and status signals are
available remotely via utility connector #1 (J16 on the MBX board).
Abort Switch
The MBX board supports the implementation of a remote abort switch
connected via pin 12 of utility connector #1 (J16 on the MBX board). The
circuit is filtered to remove switch bounce and prevent false aborts.
When activated, the Abort signal generates an interrupt signal to the
processor at IRQ7. The interrupt can be programmed as falling-edge active
or low-level active (the default is falling-edge active).
Reset Switch
The MBX board supports the implementation of a remote reset switch
connected via pin 5 of utility connector #1 (J16 on the MBX board). The
signal is debounced and filtered, and provides approximately 350ms
minimum active pulse once the reset switch has been pressed (pulled to
ground) and released.
The Reset signal resets all on-board devices, including the PC/104,
PC/104-Plus, and 8xx/COMM ports and the keep-alive power circuits.
For additional information about the reset function, see Restarting the
System on page 2-3.
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