NRF52811-QCAA-R datasheet(19/444 Pages) NORDIC

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Core components

Base address

Peripheral

Instance

Description

0x4000F000

CCM

AES CCM mode encryption

0x40010000

WDT

Watchdog timer

0x40011000

RTC

RTC1

Real-time counter 1

0x40012000

QDEC

Quadrature decoder

0x40013000

COMP

General purpose comparator

0x40014000

EGU

EGU0

Event generator unit 0

0x40014000

SWI

SWI0

Software interrupt 0

0x40015000

EGU

EGU1

Event generator unit 1

0x40015000

SWI

SWI1

Software interrupt 1

0x40016000

SWI

SWI2

Software interrupt 2

0x40017000

SWI

SWI3

Software interrupt 3

0x40018000

SWI

SWI4

Software interrupt 4

0x40019000

SWI

SWI5

Software interrupt 5

0x4001C000

PWM

PWM0

Pulse-width modulation unit 0

0x4001D000

PDM

Pulse-density modulation (digital microphone interface)

0x4001E000

NVMC

Non-volatile memory controller

0x4001F000

PPI

Programmable peripheral interconnect

N/A

0x10000000

FICR

Factory information configuration

N/A

0x10001000

UICR

User information configuration

Table 4: Instantiation table

4.3 NVMC — Non-volatile memory controller

The non-volatile memory controller (NVMC) is used for writing and erasing of the internal flash memory

and the UICR (user information configuration registers).

The CONFIG on page 21 is used to enable the NVMC for writing (CONFIG.WEN) and erasing

(CONFIG.EEN). The user must make sure that writing and erasing are not enabled at the same time. Having

both enabled at the same time may result in unpredictable behavior.

The CPU must be halted before initiating a NVMC operation from the debug system.

4.3.1 Writing to flash

When writing is enabled, full 32-bit words are written to word-aligned addresses in flash.

As illustrated in Memory on page 16, the flash is divided into multiple pages. The same 32-bit word in

the flash can only be written nWRITE number of times before a page erase must be performed.

The NVMC is only able to write

0 to bits in the flash that are erased (set to 1). It cannot rewrite a bit back

1. Only full 32-bit words can be written to flash using the NVMC interface. To write less than 32 bits,

write the data as a full 32-bit word and set all the bits that should remain unchanged in the word to

Note that the restriction on the number of writes (nWRITE) still applies in this case.

Only word-aligned writes are allowed. Byte or half-word-aligned writes will result in a hard fault.

The time it takes to write a word to flash is specified by tWRITE. The CPU is halted while the NVMC is writing

to the flash.

4.3.2 Erasing a page in flash

When erase is enabled, the flash memory can be erased page by page using the ERASEPAGE on page

21.

4454_140 v1.0

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