ST STM32F103xx series User Manual

Contents PM0075
2/31 Doc ID 17863 Rev 1
Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Flash module organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Reading/programming the embedded Flash memory . . . . . . . . . . . . . 11
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.1 Instruction fetch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.2 D-Code interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.3 Flash access controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Flash program and erase controller (FPEC) . . . . . . . . . . . . . . . . . . . . . . 12
2.3.1 Key values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3.2 Unlocking the Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3.3 Main Flash memory programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3.4 Flash memory erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3.5 Option byte programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.4 Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4.1 Read protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4.2 Write protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.4.3 Option byte block write protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.5 Option byte description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3 Register descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1 Flash access control register (FLASH_ACR) . . . . . . . . . . . . . . . . . . . . . . 23
3.2 FPEC key register (FLASH_KEYR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3 Flash OPTKEY register (FLASH_OPTKEYR) . . . . . . . . . . . . . . . . . . . . . 24
3.4 Flash status register (FLASH_SR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.5 Flash control register (FLASH_CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.6 Flash address register (FLASH_AR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.7 Option byte register (FLASH_OBR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.8 Write protection register (FLASH_WRPR) . . . . . . . . . . . . . . . . . . . . . . . . 28
3.9 Flash register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

ST STM32F103xx series Specifications

General

Series	STM32F103xx
Core	ARM Cortex-M3
Operating Frequency	Up to 72 MHz
GPIO Pins	Up to 80
Operating Voltage	2.0 V to 3.6 V
ADC	12-bit
Communication Interfaces	USART, SPI, I2C, CAN, USB
Operating Temperature	-40°C to +85°C
Package	BGA

Summary

STM32F10xxx Flash Memory Programming and Erasing

Flash Memory Read Operations and Prefetching

Details how to read data from Flash memory, including instruction fetches and prefetch buffer.

Flash Program and Erase Controller (FPEC)

Covers the FPEC block, its registers, and key values for memory operations.

Unlocking Flash Memory and Main Programming

Explains the sequences for unlocking FPEC and the process of programming main Flash memory.

Standard Flash Memory Programming Procedure

Flash Memory Erase Procedures

Details methods for erasing Flash memory, including page and mass erase operations.

STM32F10xxx Option Byte Programming

Describes the specific procedure for programming the device's option bytes.

Flash Memory Protection Mechanisms

Covers read protection, unprotection, and write protection for Flash memory.

Option Byte Protection and Description

STM32F10xxx Flash Interface Register Details

Flash Status Register (FLASH_SR)

Flash Control Register (FLASH_CR)