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The last header labeled Misc has connections to processor pins other than the port pins.
ALE
EXTERNAL
RESET
Vcc
Read
RD
GND
Write
WR
If external operations do not want pull-ups on the port pin, both the switches and the LEDs can be
disconnected from the processor. To isolate the LEDs, remove the jumper set labeled Port B, and
to isolate the switches, remove the jumper set labeled Port D.
Using Analog Functions
The A2D converters use the header labeled
Analog
for the A/D inputs on Port F, which is input
only. A +10V to -10V supply is provided on the connector marked Op-Amp next to the crystal. A
lead from this connector can be used for an external amplifier for the ADC inputs. The layout of
the Analog header is shown below.
Analog Port
: Marked on Board
ADC1
ADC3
ADC5
ADC7
ANALOG
REF
ADC0
ADC2
ADC4
ADC6
ANALOG
GND
The A/D converters can use either the on-board (Internal) Voltage Reference or an external
Voltage Reference.
Cut out marked on
board to give
orientation
Extra Connection for
Vcc
Extra Connection for
Ground
Cut out marked on
board to give
orientation
ADC0 - ADC7 connected to Port F PF0 - PF7
