STM32L4R9ZIT6 datasheet(19/306 Pages) STMICROELECTRONICS

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STM32L4R5xx, STM32L4R7xx and STM32L4R9xx

Functional overview

3.4

Embedded Flash memory

The STM32L4Rxxx devices feature 2 Mbytes of embedded Flash memory which is

available for storing programs and data.

The Flash interface features:

–

Single or dual bank operating modes

–

Read-while-write (RWW) in dual bank mode

This feature allows to perform a read operation from one bank while an erase or program

operation is performed to the other bank. The dual bank boot is also supported. Each bank

contains 256 pages of 4 or 8 Kbytes (depending on the read access width).

Flexible protections can be configured thanks to the option bytes:

• Readout protection (RDP) to protect the whole memory. Three levels of protection are

available:

– Level 0: no readout protection

– Level 1: memory readout protection; the Flash memory cannot be read from or written

to if either the debug features are connected or the boot in RAM or bootloader are

selected

– Level 2: chip readout protection; the debug features (Cortex-M4 JTAG and serial

wire), the boot in RAM and the bootloader selection are disabled (JTAG fuse). This

selection is irreversible.

•

Write protection (WRP): the protected area is protected against erasing and

programming:

–

In single bank mode, four areas can be selected with 8-Kbyte granularity.

–

In dual bank mode, two areas per bank can be selected with 4-Kbyte granularity.

Table 3. Access status versus readout protection level and execution modes

Area

Protection

level

User execution

Debug, boot from RAM or boot

from system memory (loader)

Read

Write

Erase

Read

Write

Erase

Main

memory

Yes

N/A

System

memory

Yes

N/A

Option

bytes

Yes

N/A

Backup

registers

1Yes

Yes

N/A(1)

1. Erased when RDP change from Level 1 to Level 0.

N/A(1)

Yes

N/A

SRAM2

Yes

Yes(1)

No(1)

Yes

N/A

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