AN3422 datasheet(32/52 Pages) STMICROELECTRONICS

32 / 52 page

Peripheral migration

AN3422

32/52

Doc ID 018976 Rev 2

4.9

FLASH

The table below presents the difference between the FLASH interface of STM32F1 series

and STM32L1 series, which can be grouped as follows:

●

New interface, new technology

●

New architecture

●

New read protection mechanism, 3 read protection levels with JTAG fuse

Consequently the L1 Flash programming procedures and registers are different from the F1

series, and any code written for the Flash interface in the F1 series needs to be rewritten to

run on L1 series.

For more information on programming, erasing and protection of the L1 Flash memory,

please refer to the STM32L1xx Flash programming manual (PM0062).

Table 12.

FLASH differences between STM32F1 series and STM32L1 series

Feature

STM32F1 series

STM32L1 series

Wait State

up to 2

up to 1 (depending on the

supply voltage)

Main/Program

memory

Start Address

0x0800 0000

End Address

up to 0x080F FFFF

up to 0x0805 FFFF

Granularity

Page size = 2 Kbytes

except for Low and Medium

density page size = 1 Kbytes

Sector size = 4 Kbytes:

16 Pages of 256 bytes

EEPROM memory

Start Address

Available through SW emulation

(1)

0x0808 0000

End Address

0x0808 2FFF

System memory

Start Address

0x1FFF F000

0x1FF0 0000

End Address

0x1FFF F7FF

0x1FF0 1FFF

Option Bytes

Start Address

0x1FFF F800

0x1FF8 0000/0x1FF8 0080

End Address

0x1FFF F80F

0x1FF8001F/0x1FF8 009F

OTP

Start Address

End Address

Flash interface

Start address

0x4002 2000

0x4002 3C00

Programming

procedure

Same for all product lines

Different from F1 series

Erase granularity

Page (1 or 2 Kbytes)

Program memory: Page (256

bytes)

DATA EEPROM memory: byte/

halfword/ word / double word

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