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July 2009 Doc ID 15468 Rev 1 1/18
AN2945
Application note
STM8S and STM32™ MCUs: a consistent 8/32-bit product line
for painless migration
Introduction
Following the market launch of the award winning STM32™ microcontroller,
STMicroelectronics completes the renewal of its microcontroller product line with the
announcement of the STM8S family. Significant effort has been made to rationalize the
MCU portfolio, in particular by capitalizing on common peripherals and software tools with
the aim to easing product migration.
The cost, in terms of both time and money, of maintaining a development team to design in
a new MCU family is a major criterion when selecting a microcontroller supplier. It is
therefore an advantage to make this kind of non-recurring investment if it applies to a broad
range of MCUs. With an MCU product line ranging from 20 to 144 pins, and memory sizes
from 2 to 512 Kbytes, the 8-bit STM8S and 32-bit STM32 families bring a lot of flexibility
when building a product portfolio. Should an 8-bit application run out of MIPS, there is an
upgrade path to the STM32 family. Conversely, if you wish to cut costs on a 32-bit platform,
it is relatively simple to switch to the STM8 family.
This document presents the similarities and common features of the STM8S and STM32
product lines, with a view of helping migration from one family to the other.
www.st.com
