NRF52810-QCAA-R datasheet(201/483 Pages) NORDIC

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Peripherals

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

D D

B B B B B

A A

Reset 0x00000000

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

RW Field

Value Id

Value

Description

Task

Task mode

The GPIO specified by PSEL will be configured as an output

and triggering the SET[n], CLR[n] or OUT[n] task will perform

the operation specified by POLARITY on the pin. When

enabled as a task the GPIOTE module will acquire the pin

and the pin can no longer be written as a regular output pin

from the GPIO module.

RW PSEL

[0..31]

GPIO number associated with SET[n], CLR[n] and OUT[n]

tasks and IN[n] event

RW POLARITY

When In task mode: Operation to be performed on output

when OUT[n] task is triggered. When In event mode:

Operation on input that shall trigger IN[n] event.

None

Task mode: No effect on pin from OUT[n] task. Event mode:

no IN[n] event generated on pin activity.

LoToHi

Task mode: Set pin from OUT[n] task. Event mode: Generate

IN[n] event when rising edge on pin.

HiToLo

Task mode: Clear pin from OUT[n] task. Event mode:

Generate IN[n] event when falling edge on pin.

Toggle

Task mode: Toggle pin from OUT[n]. Event mode: Generate

IN[n] when any change on pin.

RW OUTINIT

When in task mode: Initial value of the output when the

GPIOTE channel is configured. When in event mode: No

effect.

Low

Task mode: Initial value of pin before task triggering is low

High

Task mode: Initial value of pin before task triggering is high

6.9.5 Electrical specification

6.10 PDM — Pulse density modulation interface

The pulse density modulation (PDM) module enables input of pulse density modulated signals from

external audio frontends, for example, digital microphones. The PDM module generates the PDM clock

and supports single-channel or dual-channel (Left and Right) data input. Data is transferred directly to

RAM buffers using EasyDMA.

Listed here are the main features for PDM:

• Up to two PDM microphones configured as a Left/Right pair using the same data input

• 16 kHz output sample rate, 16-bit samples

• EasyDMA support for sample buffering

• HW decimation filters

The PDM module illustrated in PDM module on page 202 is interfacing up to two digital microphones

with the PDM interface. It implements EasyDMA, which relieves real-time requirements associated with

controlling the PDM slave from a low priority CPU execution context. It also includes all the necessary

digital filter elements to produce PCM samples. The PDM module allows continuous audio streaming.

4430_161 v1.0

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