DocID026267 Rev 1

9/15

TN1176

Peripheral migration

14

Note:

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

which STM32L15xx6/8/B is ‘Cat.1’ device, STM32L15xx6/8/B-A is ‘Cat.2’ device,

STM32L100x6/8/B is ‘Cat.1’ device, STM32L100x6/8/B-A is ‘Cat.2’ device and to the

STM32L15xx6/8/B-A, STM32L15xx6/8/B, STM32L100x6/8/B-A, STM32L100x6/8/B

datasheets. Documents are available for download from the company website at

www.st.com/stm32.

3.1

Main peripheral/system changes

Some system properties and peripherals configurations were changed in the

STM32L15xx6/8/B-A and STM32L100x6/8/B-A devices. The following sections describe

these changes.

3.1.1

RAM space increase

The RAM area was increased in the STM32L15xx6/8/B-A device as follows:



from 10 kB to 16 kB for STM32L15xx6-A,



from 10 kB to 32 kB for STM32L15xx8-A,



from 16 kB to 32 kB for STM32L15xxB-A.

The RAM area was increased in the STM32L100x6/8/B-A device:



from 10 kB to 16 kB for STM32L100xB-A

This increase permits the applications to use more RAM variables (larger buffers).

3.1.2

Extended RTC version

The RTC version V2.0, the same in the whole L1 family is used in the STM32L15xx6/8/B-A

and STM32L100x6/8/B-A devices. The new RTC is backward compatible with RTC version

V1.0 used in STM32L15xx6/8/B and STM32L100x6/8/B devices. To use the new RTC

features, it is necessary to use updated version of STM32L1xx Standard Peripherals

Library.

The main features added into new RTC are the following:



the subsecond resolution,



the more accurate digital calibration,



three improved tamper detection inputs (instead of one input in the previous version).

Internal voltage

reference

YES

YES

Unique ID

NO

NO

MCO

YES

YES

PCROP

NO

NO

1. The grayed cells highlight the differences between the device sets.

Function

STM32L100x6/8/B

STM32L100x6/8/B-A

Behavior / impact to software