M87222NF-D Development System questions
10.3. MBDEV-A - Accessing the I/O pins
There are three possible ways to connect the I/O pins on the development board.
Method 1 - Direct connection.
Using this method, the user just connects a wire from the hole, next to the
pin name, to the prototype area.
The user then connects a custom circuit on the prototype area.
Method 2 - LED connection.
Using this method, the user solders a 1K resistor on the "RES" connection
next to the pin name.
Then, a LED is soldered to the "LED" connection next to the pin name.
The user then has his program put the pin "low" and the LED will go on.
Keep in mind that the +5V pin is the right one. Solder the LED accordingly.
The status of the pin can be monitored by connecting a voltmeter or scope
to the hole next to the pin name.
Method 3 - Pullup connection
Using this method, the user solders a 4K resistor on the "RES" connection
next to the pin name.
Then, a jumper is soldered to the "LED" connection next to the pin name.
Then, the user connects a wire from the hole, next to the pin name, to the
prototype area. The user then connects a custom circuit on the
prototype area.
The I/O pin now has a pullup resistor and the circuit on the prototype area is
less cluttered.
Note that each pin name has two holes to the left of it.
The hole on the right can be used to connect to the prototype area and the hole on the left
can be used to monitor the signal.
10.4. MBDEV-A - I2C Bus pins
I2C Bus access can be provided, in the prototype area, by connecting to pins SCL and SDA.
