AN4654 datasheet(14/32 Pages) STMICROELECTRONICS

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Peripheral migration

AN4654

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DocID027444 Rev 1

3.4

Reset and clock controller (RCC) interface

The main differences related to the RCC (Reset and clock controller) in the STM32L0 series

versus STM32L1 series are presented in Table 5.

Table 5. RCC differences between STM32L1 and STM32L0 series

RCC

STM32L1 series

STM32L0 series

HSI 48

High speed internal oscillator at 48MHz

HSI

8 MHz RC factory-trimmed

Similar, can be used after wake-up from the

Stop mode

LSI

37 kHz RC

Similar

HSE

1 - 32 MHz

1 - 32 MHz(1)

LSE

32.768 kHz

32.768 kHz driving strength control

PLL

Main PLL

Similar

System clock source HSI, HSE, MSI or PLL

Similar

System clock

frequency

Up to 32 MHz

MSI = 2.097 MHz after reset

Similar

APB1/APB frequency Up to 32 MHz

Similar

RTC clock source

LSI, LSE or HSE

Similar

MCO clock source

SYSCLK, HSI, MSI, HSE, PLL, LSI, LSE

SYSCLK, HSI, MSI, HSE, PLL, LSI, LSE, HSI48

Internal oscillator

measurement /

calibration

LSI, MSI, HSI can be measured with

respect to LSE or HSE clock by using

TIM9, TIM10 or TIM11.

LSI, MSI, HSI can be measured with respect to

LSE or HSE clock by using TIM21.

HSI48 can be calibrated on the run by the mean

of the CRS using a reference clock.

1. Same feature but spec change or enhancement

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