DocID026269 Rev 2

7/12

TN1177

Peripheral migration

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Note:

For additional information, please refer to the STM32L100xx, STM32L151xx, STM32L152xx

which STM32L15/6xxC-A and STM32L15/6xxC are ‘Cat.3’ devices, and to the

STM32L15/6xxC datasheets. Documents are available for download from the company

website at www.st.com/stm32.

3.1

Main peripherals/system changes

Some system properties and peripherals configuration were changed in the

STM32L15/6xxC device. In the next are described those changes. The following sections

describe these changes.

3.1.1

LCD rails decoupling

The external decoupling capability of LCD rails was implemented to improve the LCD

contrast (for example for large LCD displays with higher segments capacity). On

STM32L15/6xxC devices, specific pins can be connected to external capacitors that

maintain a stable LCD rail voltage while driving the LCD segments.

Clock

HSI/HSE/LSI/LSE

CSS on HSE/LSE

HSI/HSE/LSI/LSE

CSS on HSE/LSE

No change

HSI/HSI clock

trimming

+/- 1%

+/- 1%

No change

RTC version

RTC V2.0

RTC V2.0

No change

DAC

2

2

No change

ADC (total / fast

channels)

1 (25 / 6)

1 (25 / 6)

No change

Comparator

2

2

No change

Touch sensing

[channels]

23

23

No change

Temperature

sensor

YES

YES

No change

Internal voltage

reference

YES

YES

No change

Unique ID

YES

YES

No change

MCO

YES

YES

No change

PCROP

NO

YES

New memory protection feature

implemented: Proprietary code read

out protection (only its execution is

allowed). If not used then no

software change is needed (only

added extension of existing

protections).

Table 3. STM32L15/6xxC and STM32L15/6xxC-A device differences (continued)

Function

STM32L15/6xxC-A STM32L15/6xxC

Behavior / impact to software