April 2015

DocID027444 Rev 1

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AN4654

Application note

Migrating between STM32L1 and STM32L0 series microcontrollers

Introduction

For designers of STM32 applications, it is important to be able to easily replace one

microcontroller with another within the same product family.

One key advantage of STM32 MCUs is their simplified porting thanks to a strong focus on

compatibility across the portfolio. Migrating an application to a different microcontroller is

often needed to fulfill higher product requirements, more demanding on memory size or with

increased number of I/Os. Cost reduction is another reason for change to smaller

components and shrunk PCB area.

Table 1 lists the products addressed by this application note, prepared to help users during

the analysis of the steps required to migrate from a STM32L1 microcontroller to one of the

STM32L0 series. It gathers the most important information and lists the mandatory aspects

that users need to address.

To migrate an application from STM32L1 series to STM32L0 series, users have to analyze

the hardware migration first, then the peripheral migration and finally the firmware migration.

To fully benefit from the information included in this application note, users should be

familiar with STM32 microcontrollers, and refer to the following documents available from

•

STM32L1xx reference manual (RM0038) and product datasheets

•

STM32L0xx reference manual (RM0367) and product datasheets.

For an overview of all the STM32 microcontrollers and for a comparison of the different

features of each product series, please refer to AN3364 “Migration and compatibility

guidelines for STM32 microcontroller applications.”

Note:

The following notational convention is used in the rest of the document:

STM32L0xx is used instead of STM32L0xxxx when referring to products of STM32L0

series, and STM32L1xx is used instead of STM32L1xxxx when referring to products of

STM32L1 series.

Table 1. Applicable products

Type

Product series

Microcontrollers

STM32L0

STM32L1

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