Getting started
UM0300
8/22
These Jumpers allow the selection between ICC or I
2
C data lines. While we do the
programming the ST7 microcontroller, the jumpers must be connected on ICC side (right
side) and when the board is used for demonstration, the jumpers must be connected on the
I
2
C side (left side).
●
JP3: As shown in the
below, JP3 is used to select the clock source for the ST7
microcontroller.
Figure 8.
JP3 Settings
The default connection of this jumper is EXT side (Left Side) that is clock source external
crystal resonator and when the board is used for demonstration. You need to connect to ICC
side (Right Side) only if it is must to provide the ICC clock to the microcontroller during the
re-programming microcontroller.
●
JP4: As shown in the
below, JP4 is used for choosing power supply to be used
for USB supply or the external board supply.
Figure 9.
JP4 Settings
Connect the jumper to the Left side, whenever you want to use external power supply and to
Right side (USB side), whenever you want to use USB supply. There is no restriction as
such on using any of the power supply. You can use external power supply when you want to
use the demo board in the stand-alone mode and USB power supply while you are using the
PC GUI or in stand alone mode.
Even while providing the power to the demo from external source, you can use the PC GUI
but for that you need to provide USB connectivity using USB connector.