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DocID024597 Rev 3 79/1693

RM0351 Embedded Flash memory (FLASH)

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The Flash memory is divided in 2 banks. Each bank is organized as follows:

• A Main memory block containing 256 pages of 2 KBytes. Each page is made of 8 rows

of 256 Bytes.

• An Information block containing:

– System memory from which the device boots in System memory boot mode. The

area is reserved for use by STMicroelectronics and contains the boot loader which

is used to reprogram the Flash memory through one of the following interfaces:

USART1, USART2, USART3, USB (DFU), I2C1, I2C2, I2C3, SPI1, SPI2, SPI3. It

is programmed by STMicroelectronics when the device is manufactured, and

protected against spurious write/erase operations. For further details, please refer

to the AN2606 available from www.st.com.

– 1 KByte (128 double word) OTP (one-time programmable) bytes for user data.

The OTP area is available in Bank 1 only. The OTP data cannot be erased and

can be written only once. If only one bit is at 0, the entire double word cannot be

written anymore, even with the value 0x0000 0000 0000 0000.

– Option bytes for user configuration.

The memory organization is based on a main area and an information block as shown in

Table 5.

Table 5. Flash module - 1 MB dual bank organization

Flash area Flash memory addresses

Size

(bytes)

Name

Main memory

Bank 1

0x0800 0000 - 0x0800 07FF 2 K Page 0

0x0800 0800 - 0x0800 0FFF 2 K Page 1

0x0800 1000 - 0x0800 17FF 2 K Page 2

0x0800 1800 - 0x0800 1FFF 2 K Page 3

0x0807 F800 - 0x0807 FFFF 2 K Page 255

Bank 2

0x0808 0000 - 0x0808 07FF 2 K Page 256

0x0808 0800 - 0x0808 0FFF 2 K Page 257

0x0808 1000 - 0x0808 17FF 2 K Page 258

0x0808 1800 - 0x0808 1FFF 2 K Page 259

0x080F F800 - 0x080F FFFF 2 K Page 511

ST STM32L4x6 User Manual

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