STM32CUBEL4 datasheet(25/37 Pages) STMICROELECTRONICS

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UM1919

Demonstration firmware settings

5.1

Clock control

The demonstration firmware takes benefit of the STM32L476VGT6 clock tree by selecting

dynamically the clock configuration required by the running application/module when

running in low-power mode.

The following clock configurations are used in the demonstration firmware:

The following oscillators and PLL are used in the demonstration firmware:

Table 5. Clock configurations

Clock configuration

Application/module

USB-powered

Application/module

battery

SYSCLK: 2MHz MSI

(LPRUN voltage range 2)

Demonstration startup

IDD application

SYSCLK: 16MHz PLL from MSI 16MHz

(RUN voltage range 2)

Sound Meter

Compass

SYSCLK: 80MHz (PLL) from MSI 8MHz

(RUN voltage range 1)

Demonstration startup

All applications

Table 6. Oscillators and PLL description

Oscillators

Application/module

USB-powered

Application/module

battery

MSI from 2MHz to 16MHz

Demonstration startup

IDD application

Sound meter

Compass

LSE

LCD glass display

LSI

Internal Watchdog

for automatic FW reset

(error management)

PLL main

Demonstration startup

All applications

Sound meter

Compass

PLLSAI1

PLLSAI1_VCO= 8 MHz * PLLSAI1N = 8 * 43 =

VCO_344M

SAI_CK_x = PLLSAI1_VCO/PLLSAI1P = 344/7 =

49.142 MHz

Player

Record

Sound meter

Guitar tuner

Sound meter

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