TN1177 Datasheet, PDF (7/12 Pages) STMicroelectronics – To ease the development of STM32 microcontroller applications

TN1177
Peripheral migration
Table 3. STM32L15/6xxC and STM32L15/6xxC-A device differences (continued)
Function
STM32L15/6xxC-A STM32L15/6xxC Behavior / impact to software
Clock
HSI/HSE/LSI/LSE HSI/HSE/LSI/LSE
CSS on HSE/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
New memory protection feature
implemented: Proprietary code read
out protection (only its execution is
NO
YES
allowed). If not used then no
software change is needed (only
added extension of existing
protections).
Note:
For additional information, please refer to the STM32L100xx, STM32L151xx, STM32L152xx
and STM32L162xx advanced ARM^®-based 32-bit MCUs reference manual RM0038 in
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
3.1.1
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.
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.
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