Datasheet

One of the most distinctive features of EasyAVR
™
v7 are it’s Input/Output PORT groups. They add so
much to the connectivity potential of the board.
Everything is grouped together
PORT headers, PORT buttons and PORT LEDs are next to each
other, and grouped together. It makes development easier, and the entire
EasyAVR
™
v7 cleaner and well organized. We have also provided an additional
PORT headers on the left side of the board, so you can access any pin you want
from both sides of the board.
Tri-state pull-up/down DIP switches
Tri-state DIP switches, like SW1 on Figure 9-2, are used
to enable 4K7 pull-up or pull-down resistor on any desired
port pin. Each of these 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 9-1: I/O group contains PORT headers, tri-state pull
up/down DIP switch, buttons and LEDs all in one place
LD21LD20LD19LD18LD17LD16LD15LD14
RN24
10K
RN23
10K
RN22
10K
RN21
10K
RN20
10K
RN19
10K
RN18
10K
RN17
10K
T17T16T15T14T13T12T11T10
PB0 PB1
PB2
PB3 PB4 PB5 PB6
PB7
PB0
PB1
PB2 PB3
PB4
PB5 PB6
PB7
1 2 3 4 5 6 7 8
O
N
SW10
1 2 3 4 5 6 7 8
+
_
VCC-BRD VCC-BRD
UP
DOWN
PULL
CN9 CN10
1
2
3
4
5
6
7
8
9
10
CN11
VCC-BRD
PB0 PB1
PB2 PB3
PB4 PB5
PB6 PB7
PB0 PB1
PB2 PB3
PB4 PB5
PB6 PB7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
VCC-BRD
CN27
PB0 PB1
PB2 PB3
PB4 PB5
PB6 PB7
4k7
DATA BUS
SW4
VCC-BRD
PORTB_LEVEL
PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7
1 2 3 4 5 6 7 8
+
_
SW1
VCC
GND
BUTTON PRESS LEVEL
R13 220
VCC-BRD
R12 220
J2J1
PORTB_LED
connectivity
Figure 9-3: Schematic of the single I/O group connected to microcontroller PORTB
Input/Output Group
Figure 9-2: Tri-state
DIP switch on PORTB
page 18
EasyAVR
v7