PM0212

Glossary

Doc ID 022351 Rev 2

5/22

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Single wire interface module (SWIM)

The SWIM is a communication protocol managed by hardware in the STM8

microcontrollers. The SWIM main purpose is to provide non intrusive debug capability.

It can also be used to download programs into RAM and execute them. It can also write

(registers or RAM) or read any part of the memory space and jump to any memory

address. The SWIM protocol is used for ICP. It is accessed by providing a specific

sequence on the SWIM pin either during the reset phase or when the device is running

(if allowed by the application).

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User boot code area (UBC)

The user boot code area is a write-protected area which contains reset vector, interrupt

vectors, and IAP routine for the device to be able to recover from interrupted or

erroneous IAP programming.

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User mode

The user mode is the standard user software running mode in the STM8. It is entered

either by performing a power-on-reset on the device or by issuing the SWIM SRST

command from a development tool.

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Word

A word is a set of 4 bytes and corresponds to the memory granularity.