AN3139 datasheet(48/63 Pages) STMICROELECTRONICS

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Block-by-block compatibility analysis

AN3139

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Doc ID 16993 Rev 3

3.9.1

LSI clock frequency

In the whole STM8L family, the low-speed internal clock (LSI) is an ultralow internal power

source (a few µA), that can be permanently enabled to be used as the clock source for the

application during the Active-halt mode. It is not accurate (error of a few 10%), but it can be

periodically measured using the precise HSI clock to compensate for chip manufacturing

variations or for the drift due to temperature changes for instance.

3.9.2

HSI clock frequency

In the whole STM8L family, the HSI internal oscillator is factory calibrated in intervals of

+/-2% of the temperature range “5 to 25°C”. This value can be trimmed by the user within an

interval of +3/-4% of the range in eight steps using three trimming register bits. This enables

calibration in steps of about 1% of the range.

3.10

BEEP

In the STM8L15x/STM8L16x sub-family, the BEEP clock sources can be either the LSE or

LSI clocks. However this feature is not available in the STM8L10x sub-family and the BEEP

operates by default using the LSI clock source.

3.11

RTC

The RTC is available only in the STM8L15x/STM8L16x sub-family, with some additional

features in the low, medium+ and high density STM8L15x/STM8L16x devices. Please refer

to the AN3133 application note (“Using the STM8L15x/STM8L16x real time clock”).

Table 17.

Overview of the clocks in the STM8L family

Clocks &

Osc

STM8L10x

STM8L15x/STM8L16x

Low density

STM8L10x

Low density

STM8L15x

Medium density STM8L15x

Medium+/High density

STM8L15x/ High density

STM8L16x

LSE

32.768 kHz OSC

LSI

38 kHz RC

38KHz RC

HSE

1 - 16MHz OSC

1 - 16 MHz OSC

HSI

16 MHz RC

16MHz RC

16 MHz RC

CCO

CLK

fmaster

fmaster/2

fmaster/4

fmaster/16

HSI/Prescaler

LSI/Prescaler

HSE/Prescaler

LES/Prescaler

HSI/Prescaler

LSI/Prescaler

HSE/Prescaler

LES/Prescaler

HSI/Prescaler

LSI/Prescaler

HSE/Prescaler

LES/Prescaler

RTC CLK

32.768 kHz OSC

38 kHz RC

1 - 16 MHz OSC

16 MHz RC

32.768 kHz OSC

38 kHz RC

1 - 16 MHz OSC

16 MHz RC

32.768 kHz OSC

38 kHz RC

1 - 16 MHz OSC

16 MHz RC

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