PM0063

Reading/programming the STM32F100xx embedded Flash memory

Doc ID 16211 Rev 2

11/30

2

Reading/programming the STM32F100xx embedded

Flash memory

2.1

Introduction

This section describes how to read from or program to the STM32F100xx embedded Flash

memory.

2.2

Read operation

The embedded Flash module can be addressed directly, as a common memory space. Any

data read operation accesses the content of the Flash module through dedicated read

senses and provides the requested data.

The read interface consists of a read controller on one side to access the Flash memory,

and an AHB interface on the other side to interface with the CPU. The main task of the read

interface is to generate the control signals to read from the Flash memory as required by the

CPU. Accesses are either instruction fetches over the I-code bus, or data accesses (e.g.

literal pool) over the D-code bus. Since these two buses have the same Flash memory as

target, the interface gives priority to D-code bus accesses over I-code bus, instruction fetch

accesses.

2.2.1

Instruction fetch

The Cortex-M3 fetches the instruction over the I-Code bus and the literal pool

(constant/data) over the D-code bus.