P A G E 16
E a s y M x
P R O
v 7 a
U s e r M a n u a l
HEADERS
BUTTONS
LEDs
With enhanced connectivity as one of the key features of EasyMx PRO v7a, we have
provided
four connection headers for each PORT
. I/O PORT group contains two male
IDC10 headers. These headers are all compatible with MIKROE accessory boards, and
enable simple connection. There is
one more IDC10 header
available on the left side
of the board, next to the section with displays.
INPUT
/OUTPUT port
s view
N O T E
Because of it's orientation, header on the bottom side of the board is not
meant for placing accessory boards directly. Instead, use wire jumpers or
other ways to establish connection and utilize these pins.
The logic state of all microcontroller digital
inputs may be changed using push buttons.
Tri-state DIP switch SW10 is available for
selecting which logic state will be applied
to corresponding MCU pin when button is
pressed, for each I/O port separately. If you, for
example, place SW10.1 in VCC position, then
pressing of any push button in PORTA/H I/O
group will apply logic one to the appropriate
microcontroller pin. The same goes for
GND. If DIP switch is in the middle position
neither of two logic states will be applied to
the appropriate microcontroller pin. You can
disable pin protection 220ohm resistors by
placing jumpers J6 and J7, which will connect
your push buttons directly to VCC or GND. Be
aware that doing so you may accidentally
damage MCU in case of wrong usage.
LED (Light-Emitting Diode)
is a highly efficient
electronic light source. When connecting
LEDs, it is necessary to place a current limiting
resistor in series so that LEDs are provided
with the current value specified by the
manufacturer. The current varies from 0.2mA
to 20mA, depending on the type of the LED
and the manufacturer.. The EasyPIC v7a board
uses low-current LEDs with typical current
consumption of 0.2mA or 0.3mA, depending
of VCC voltage selection. Board contains 36
LEDs which can be used for visual indicativon
of the logic state on PORT pins. An active LED
indicates that a logic high (1) is present on
the pin. In order to enable PORT LEDs, it is
necessary to enable the corresponding DIP
switches on
SW3
.
Microcontroller
SMD resistor - limiting
current through the LED
I/O PORT group also contains 1x10 connection pad which can be used for connecting
MIKROE PROTO boards, or custom user boards.
