User Manual

F u s i o n f o r A R M v 8 M a n u a l
P A G E 17
Figure 8: I/O ports view
PORT LEDs
Each PORT contains a group of eight LEDs (9), used to visually indicate a logic state
of the specific pin. These LEDs can be found in both COMPACT PORT and EXPANDED
PORT sections. The maximum current through a single LED is limited with the 4.7k
resistor. Each LED is connected to a PORT pin and it is labeled according to the pin’s
name (in the case of the EXPANDED PORTS), or with an ordinal number of that pin (in
the case of the COMPACT PORTS), following the aforementioned color-coded labeling
scheme.
LEDs on each PORT can be disabled, when they are not needed. Having a LED on a
communication line or an A/D converter input might alter expected results, since LED
represents an additional electrical load on a particular pin.
There are two DIP switches with ten positions (poles), with each pole assigned to a
specific PORT. These DIP switches are labeled as PORT LEDS (11) on the development
board (SW4 and SW5 provided separately on the schematic). A single DIP switch
position is used to disable a group of LEDs which belong to a PORT:
ON position (up): enables LEDs for a specific PORT, associated with the particular DIP
switch position (according to the 8-bit labeling scheme)
OFF position (down): disables LEDs for a specific PORT, associated with the particular
DIP switch position (according to the 8-bit labeling scheme)
2x5 PIN HEADERS
Besides LEDs, there are also 2x5 pin headers (10) in both COMPACT PORT and
EXPANDED PORT sections. All the pins which belong to a specific PORT are routed to
the 2x5 pin header located in that PORT section, along with the GND and the power
rail. Pins on these headers are labeled with ordinal numbers which correspond to the
ordinal numbers of the pins within the specific MCU PORT. They are labeled following
the color coding scheme.
These 2x5-pin headers can be used to expand the connectivity of the Fusion for
ARM v8 development board, allowing interfacing with other devices, peripherals,
and measurement equipment, either by using IDC10 extension cables, IDC10 female
sockets, or simply by using jumper wires. Enhanced connectivity is one of the key
features of Fusion for ARM v8 development board, there are many connectivity
options provided. However, 2x5-pin headers allow the most extensive connectivity as
they expose all the available GPIO MCU pins to the outside world.
The aforementioned color-coded
labeling scheme also applies to
ordinal numbers above the DIP
switch, making it easy to understand
which DIP switch position should be
used for a specific pin.
C O N N E C T I V I T Y
149 32
6 7
5 9
10
11
8
10