Low Power Application on SAM L10 Using MPLAB® Harmony v3 Peripheral Libraries: Step 4

The Power Manager (PM) is added by default to the project graph. Select the PM peripheral library in the Project Graph window and configure it as shown below.

• Set the Performance Level Select to Performance Level 0 to reduce the power consumption of the device during Standby mode.
• Enable Dynamic Power Gating: These options allow the device to turn off a power domain during Standby mode if no peripheral contained in this power domain requests its clock.
• Set the Voltage Regulator operation in Standby Mode to operate in Low Power oriented mode during standby to reduce the power consumption of the device even more.

Under the Device Resources tab, expand Harmony > Peripherals > SUPC.
Double-click or drag and drop SUPC to add the Supply Controller (SUPC) peripheral library to the project graph.

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Select the SUPC peripheral library and configure it as shown below.

• Enable the Increase low power mode efficiency bit to optimize and reduce power consumption in Standby mode.

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The Non-volatile Memory Controller (NVMCTRL) is added by default to the project graph. Select the NVMCTRL peripheral library and configure it as shown below.

• Set Wait States to 1 to read the non-volatile memory. When the device is put in performance level 0, the device clock frequency cannot exceed 12 MHz and one wait-state is required.
• Set the Power Reduction Mode During Sleep to WAKEUP INSTANT. This bit configures the NVMCTRL to wake-up the Flash memory when the CPU wakes up from Standby mode, which allows it to reduce device wake-up time.
• Disable the Instruction Cache to reduce the device's wake-up time. When the cache is enabled, the device will look for an instruction to fetch upon interrupt in the cache at first. If the instruction is found, the device wakes up quicker, but if not, a cache miss occurs and wake-up time is longer. This option is good to enable when the instruction to fetch upon an interrupt is always stored in the cache memory, which is not the case here, as we have different interrupt sources.

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Open the Pin Configuration tab by clicking Tools > Pin Configuration.

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Once the MHC Pin Settings window is opened, scroll-down to pin number PA06 and PA07, and then configure these pins as shown below:

• Set the Pin Number #7 as GPIO:
  • Pin ID = PA06
  • Custom Name = TEST_GPIO
  • Function = GPIO
  • Direction = Out
  • Latch = Low
• Set the Pin Number #8 as GPIO:
  • Pin ID = PA07
  • Custom Name = LED0
  • Function = GPIO
  • Direction = Out
  • Latch = High

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Under the Project Graph tab, click on System, and configure as below to give a name of your liking to the default template main file generated by the MCC.

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