Datasheet

page 24
One of the most distinctive features of mikromedia
™
workStation 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 mikromedia
™
workStation 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 that side
of the board too.
Tri-state pull-up/down DIP switches
Tri-state DIP switches, like SW1 on Figure 6-3, 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 6-1: I/O group contains PORT headers, tri-state pull
up/down DIP switch, buttons and LEDs all in one place
VCC
GND
BUTTON
R6
220
R7
220
VCC-3.3V
J6J5
1 2 3 4 5 6 7 8
+
_
SW2
G0 _LEVEL
G0.0 G0.1 G0.2 G0.3 G0.4 G0.5 G0 .6
G0 .7
G0_LED
LD0_8LD0_7LD0_6LD0_5LD0_4LD0_3LD0_2LD0_1
RN6_8
10K
RN6_7
10K
RN6_6
10K
RN6_5
10K
RN6_4
10K
RN6_3
10K
RN6_2
10K
RN6_1
10K
T0_8T0_7T0_6T0_5T0_4T0_3T0_2T0_1
G0 .0 G0 .1
G0.2 G0.3 G0.4 G0.5 G0 .6 G0 .7
VCC-3.3V
VCC-3.3V
G0 .0 G0 .1 G0 .2
G0 .3 G0 .4 G0.5 G0 .6 G0 .7
G0.0 G0.1
G0.2 G0.3
G0.4 G0.5
G0.6 G0.7
UP
DOWN
PULL
1 2 3 4 5 6 7 8
+
_
SW1
CN2
G0.0 G0.1
G0.2 G0.3
G0.4 G0.5
G0.6 G0.7
CN3
G0.0 G0.1
G0.2 G0.3
G0.4 G0.5
G0.6 G0.7
CN4
1
2
3
4
5
6
7
8
9
10
CN1
N1X10
VCC-3.3V
VCC-3.3V VCC-3.3V
G0.0
G0.2
G0.4
G0.6
G0.1
G0.3
G0.5
G0.7
1 2 3 4 5 6 7 8
O
N
SW3
DATA BUS
4K7
Figure 6-3: Schematic of the single I/O GROUP0
Input/Output Group
Figure 6-2:
Tri-state DIP
switch on GROUP0
Button press level tri-state DIP
switch is used to determine
which logic level will be applied
to port pins when buttons are
pressed
connectivity