Peripheral migration

TN1177

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DocID026269 Rev 2

The backward compatibility is fulfilled, there is not need of any software change. To use the

new feature, the dedicated pins must be configured as inputs and the external capacitors

should be connected and the LCD_CAPA[4:0] bits in the SYSCFG_PMC register must be

configured.

For more details about LCD rail decoupling please refer to the STM32L100xx,

RM0038 in which STM32L15/6xxC-A and STM32L15/6xxC are ‘Cat.3’ devices, and to the

STM32L15/6xxC datasheets.

3.1.2

Proprietary code protection (PCROP)

The read protection of a given Flash area is implement in STM32L15/6xxC devices. The

Flash area cannot be read by any access (including software), it can be only executed. It

can be used as intellectual property read protection of proprietary third party code which can

be executed on customer side.

The implementation of this proprietary code read out protection (PCROP) is backward

compatible. To use the PCROP feature it is necessary to correctly program the added option

bytes (SPRMOD and WRPx option bytes).

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.

3.2

Device limitations, changes and/or updates

A new revision of errata sheet has been published for the STM32L15/6xxC devices. Several

limitations that had been reported for the STM32L15/6xxC-A have been solved, while new

limitations have been introduced. This section describes the changes in the device

limitations.

Please refer to STM32L15/6xxC-A errata sheet and STM32L15/6xxC errata sheet for details

on the device limitations.

3.2.1

Removed limitations

The following limitations that applied to STM32L15/6xxC-A devices do not apply to

STM32L15/6xxC devices:

•

Missing analog switch on GPIO PC10,

•

Pull-up on PB7 when configured in analog mode,

•

Injection from LCD_SEG2, LCD_SEG5, LCD_SEG21 pins.

3.2.2

Newly introduced limitations

The following limitations which were not present in nor STM32L15/6xxC-A devices have

been introduced for STM32L15/6xxC devices:

•

The operational amplifier factory trimming value cannot be selected (manual

initialization is required).

•

Data EEPROM cycling is limited to 100 kcycles instead of 300 kcycles.

•

ADC accuracy lowered.