User Manual

Page 17
Figure 4-1:
Two LEDs, two buttons
and a reset button
4. Buttons and LEDs
The board also contains a
01
reset button and
a pair of
02
buttons and
03
LEDs, as well as
an ON/OFF switch. The RESET button
is used to manually reset the
microcontroller—it generates
a low voltage level on the
microcontroller’s reset pin. LEDs
can be used for visual indication
of the logic state on two pins (RH3
and RD7). An active LED indicates
that a logic high (1) is present on the pin.
Pressing any of the two buttons can change
the logic state of the microcontroller pins (T2 and
T3) from logic high (1) to logic low (0).
03 02 01