September 2012

Doc ID 17766 Rev 5

1/34

PM0073

Programming manual

STM32Wxxx Flash memory microcontrollers

Introduction

This programming manual describes how to program the Flash memory of STM32W108

microcontrollers for the wireless line.

The STM32Wxxx embedded Flash memory can be programmed using in-circuit

programming or in-application programming.

The

in-circuit programming (ICP) method is used to update the entire contents of the

Flash memory, using the JTAG, SWD protocol or the boot loader to load the user application

into the microcontroller. ICP offers quick and efficient design iterations and eliminates

unnecessary package handling or socketing of devices.

In contrast to the ICP method,

in-application programming (IAP) can use any

etc.) to download programming data into memory. IAP allows the user to re-program the

Flash memory while the application is running. Nevertheless, part of the application has to

have been previously programmed in the Flash memory using ICP.

The Flash interface implements instruction access and data access based on the AHB

protocol. It implements a prefetch buffer that speeds up CPU code execution. It also

implements the logic necessary to carry out Flash memory operations (Program/Erase).

Program/Erase operations can be performed over the whole product voltage range.

Read/Write protections and option bytes are also implemented.

Table 1.

Applicable products

Type

Part numbers

Microcontroller

STM32W108CB, STM32W108HB, STM32W108C8,

STM32W108CC, STM32W108CZ

www.st.com