DocID15687 Rev 5

7/29

PM0059

Flash memory interface

28

2.3

Flash memory

The Flash memory has the following main features:

•

Capacity up to 1 Mbyte

•

128 bits wide data read

•

Byte, half-word, word and double word write

•

Sector and mass erase

•

Memory organization

The Flash memory is organized as follows:

–

Main memory block containing 4 sectors of 16 Kbytes, 1 sector of 64 Kbytes, and

7 sectors of 128 Kbytes

–

System memory used to boot the device in System memory boot mode.

This area is reserved for STMicroelectronics and contains the bootloader which is

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

USART1, USART3, CAN2, USB OTG FS in Device mode (DFU: device firmware

upgrade). The bootloader is programmed by ST when the device is manufactured,

and protected against spurious write/erase operations.

–

512 OTP (one-time programmable) bytes for user data

The OTP area contains 16 additional bytes used to lock the corresponding OTP

data block.

–

Option bytes: read and write protections, BOR level, watchdog software/hardware

and reset when the device is in Standby or Stop mode.

•

Low power modes (for details refer to the Power control (PWR) section of the reference

manual)

Table 2. Flash module organization

Block

Name

Block base addresses

Size

Main memory

Sector 0

0x0800 0000 - 0x0800 3FFF

16 Kbyte

Sector 1

0x0800 4000 - 0x0800 7FFF

16 Kbyte

Sector 2

0x0800 8000 - 0x0800 BFFF

16 Kbyte

Sector 3

0x0800 C000 - 0x0800 FFFF

16 Kbyte

Sector 4

0x0801 0000 - 0x0801 FFFF

64 Kbyte

Sector 5

0x0802 0000 - 0x0803 FFFF

128 Kbyte

Sector 6

0x0804 0000 - 0x0805 FFFF

128 Kbyte

.

.

.

.

.

.

.

.

.

Sector 11

0x080E 0000 - 0x080F FFFF

128 Kbyte

System memory

0x1FFF 0000 - 0x1FFF 77FF

30 Kbyte

OTP area

0x1FFF 7800 - 0x1FFF 7A0F

528 bytes

Option bytes

0x1FFF C000 - 0x1FFF C00F

16 bytes