1.12 Low Power Modes

The Clock system generates and distributes the clock for the processor and peripherals. This example application shows how device enters in the Idle mode and Ultra low power mode.

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/clock/low_power/firmware .

To build the application, refer to the following table and open the project using its IDE.

To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to configure, build and run bootstrap loader project and use it to bootstrap the application binaries.

The following table shows the target hardware for the application projects.

1. Build the application using its IDE
2. Open the Terminal application (Ex.:Tera term) on the computer.
3. Connect to the (USB to Serial) COM port and configure the serial settings as follows:
   • Baud : 115200
   • Data : 8 Bits
   • Parity : None
   • Stop : 1 Bit
   • Flow Control : None
4. LED toggles every 1 second
5. Press ‘0’ in the terminal window
   • Observe the message “Entering Idle Mode for 30 seconds” in the terminal window and LED stops toggling
   • Wait for 30 seconds and observe the message “Leaving Idle Mode” in the terminal window and LED toggles every 1 second
6. Press ‘1’ in the terminal window
   • Observe the message “Entering ULP0 Mode for 30 seconds” in the terminal window and LED stops toggling
   • Wait for 30 seconds and observe the message “Leaving ULP0 Mode” in the terminal window and LED toggles every 1 second