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STM8S family compatibility

AN2645

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STM8S family compatibility

1.1

Family concept

The STM8S family is one of a growing number of different STM8 microcontroller families.

All these STM8 microcontroller families are based on common robust and low cost 8-bit high

performance core with rich set of enhanced peripherals. This ensures high level of

compatibility within the STM8 ‘world’, especially in terms of software development,

compilers, debugging environment, programming tools and driver libraries.

The STM8S product family offers a wide choice of memory sizes and package types to fit

different application requirements as closely as possible. So when there are new

requirements on the application side, it can make sense to switch to another STM8S type

with different memory capacity or package size.

The STM8S family is divided into two product lines, and within each product line there are

two main sub-families:

•

STM8S Performance line includes STM8S208 and STM8S207 sub-families

•

STM8S Access line includes STM8S105 and STM8S103 sub-families

The STM8S family also includes some application-specific microcontrollers (ASSM) like the

STM8S903 which is derived from the STM8S103 sub-family and which has extra features.

Both main product lines provide a complete set of essential peripherals. STM8S Access

line targets applications requiring reduced cost, lower memory capacity, fewer GPIOs and

less advanced features.

The wide range of available pin-counts and package sizes is discussed in Chapter 3.1:

Package pinout.

All STM8S family microcontrollers use the same application development tools:

●

Embedded single wire interface module (SWIM)

●

Software integrated development environment (IDE) tools including assembler,

simulator, debugger, programmer:

–

ST Visual Develop (ST)

–

Ride (Raisonance)

●

In-circuit debugging and programming tools

–

STIce from ST (full hardware emulator)

–

RLink from Raisonance (low cost debug/programming tool)

●

Starter kits and evaluation boards

●

C compiler and assembler tool chains (Cosmic, Raisonance)

●

Firmware libraries (peripheral control examples, MISRA or class B compliance, touch

sensing)

●

Application notes

By using a common development environment, you significantly reduce code maintenance

effort and shorten the time-to-market, especially in cases when an application has to be

migrated from one STM8 microcontroller to another.

By using the drivers provided in the STM8S firmware library to interface with the hardware, it

becomes reasonably straightforward to move the application firmware from one STM8S

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