User`s guide

page 18
One of the most distinctive features of EasyMx
PRO
™
v7 are it’s Input/Output PORT groups. They add
so much to the connectivity potential of the board.
Everything is grouped together
It took us a while to realize that having PORT headers, PORT buttons and
PORT LEDs next to each other, and grouped together, makes development easier,
and the entire EasyMx PRO
™
v7 cleaner and well organized. We have also provided an
additional PORT headers on the right side of the board, so you can access any pin you want from that side of the board too.
Tri-state pull-up/down DIP switches
Tri-state DIP switches, like SW5 on Figure 6-3, are
used to enable 4K7 pull-up or pull-down resistor on
any desired port pin. Each of those switches has three
states:
1. middle position disables both pull-up and pull-down
feature from the PORT pin
2. up position connects the resistor in pull-up state to
the selected pin
3. down position connects the resistor in pull-down
state to the selected PORT pin.
Figure 6-1: I/O group contains PORT header, tri-state pull
up/down DIP switch, buttons and LEDs all in one place
Input/Output Group
connectivity
PE0 PE1 PE2 PE3 PE4 PE5 PE6 PE7
PE0 PE1 PE2 PE3 PE4 PE5 PE6 PE7
LD47BLD46BLD45BLD44BLD43BLD42BLD41BLD40B
RN38
10K
RN37
10K
RN36
10K
RN35
10K
RN34
10K
RN33
10K
RN32
10K
RN31
10K
T38T37T36T35T34T33T32T31
VCC-3.3V VCC-3.3V
VCC-3.3V
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE0 PE1
PE2 PE3
PE4 PE5
PE6 PE7
PE0 PE1
PE2 PE3
PE4 PE5
PE6 PE7
UP
DOWN
PULL
1 2 3 4 5 6 7 8
+
_
SW5
CN24 CN33
O
N
SW15
PORTE LED
1 2 3 4 5
6
7 8
DATA BUS
VCC GND
BUTTON PRESS LEVEL
R26
220
R27
220
VCC-3.3V
PORTE LEVEL
J7
J6
1 2 3 4 5 6 7 8
+
_
SW16
Figure 6-3: Schematics of the single I/O group connected to microcontroller PORTE
Button press level tri-state DIP
switch is used to determine
what logic state will push
buttons be connected to when
pressed
Figure 6-2:
Tri-state DIP
switch on PORTE
EasyMx PRO
v7