NRF52820-QDAA-R datasheet(94/437 Pages) NORDIC

94 / 437 page

Peripherals

Flash memory regions can be assigned individual ACL permission schemes. The following registers are

involved:

• PERM register, where the permissions are configured.

• ADDR register, where the word-aligned start address for the flash page is defined.

• SIZE register, where the size of the region the permissions are applied to is determined.

Note: The size of the region in bytes is restricted to a multiple of the flash page size, and the

maximum region size is limited to half the flash size. See Memory on page 15 for more information.

...

Page 0

Page 1

Page 2

...

Page N+1

Page N

On-chip flash memory

ACL[0].ADDR

ACL[7].ADDR

ACL[0].SIZE

Page 3

1 1

ACL[0].PERM

1 1

Read/

Write

protect

ACL[7].PERM

0 1

Write

protect

ACL[7].SIZE

1 0 0 0 0 0

0 0 0 0

0 0

Figure 28: Protected regions of on-chip flash memory

There are four defined ACL permission schemes, with different combinations of read/write permissions:

Read

Write

Protection description

No protection. Entire region can be executed, read, written or erased.

Region can be executed and read, but not written or erased.

Region can be written and erased, but not executed or read.

Region is locked for all access until next reset.

Table 24: Permission schemes

Note: If a permission violation to a protected region is detected by the ACL peripheral, the request

is blocked and a Bus Fault exception is triggered.

4463_156 v1.0

NRF52820-QDAA-R Datasheet(PDF) 94 Page - Nordic Semiconductor

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