NRF52810-QFAA-R datasheet(263/483 Pages) NORDIC

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Peripherals

100% duty cycle

New value load

Previously

loaded

duty cycle

0% duty cycle

LOOP.CNT

(LOOP.CNT - 1)

Loop counter

...

last loaded

duty cycle

maintained

Figure 55: Complex sequence (LOOP.CNT>0) starting with SEQ[1]

Note that if a sequence is in use in a simple or complex sequence, it must have a length of SEQ[n].CNT > 0 .

6.12.3 Limitations

The previous compare value will be repeated if the PWM period is selected to be shorter than the time it

takes for the EasyDMA to fetch from RAM and update the internal compare registers.

This is to ensure a glitch-free operation even if very short PWM periods are chosen.

6.12.4 Pin configuration

The OUT[n] (n=0..3) signals associated to each channel of the PWM module are mapped to

physical pins according to the configuration specified in the respective PSEL.OUT[n] registers. If a

PSEL.OUT[n].CONNECT is set to Disconnected, the associated PWM module signal will not be connected to

any physical pins.

The PSEL.OUT[n] registers and their configurations are only used as long as the PWM module is enabled

and PWM generation is active (wave counter started), and retained only as long as the device is in System

ON mode, see POWER chapter for more information about power modes.

To ensure correct behaviour in the PWM module, the pins used by the PWM module must be configured

in the GPIO peripheral as described in Recommended GPIO configuration before starting PWM generation

on page 264 before enabling the PWM module. The pins' idle state is defined by the OUT registers in

the GPIO module. This is to ensure that the pins used by the PWM module are driven correctly, if PWM

generation is stopped through a STOP task, the PWM module itself is temporarily disabled, or the device

temporarily enters System OFF. This configuration must be retained in the GPIO for the selected IOs as

long as the PWM module is supposed to be connected to an external PWM circuit.

4430_161 v1.0

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NRF52810-QFAA-R Datasheet(PDF) 263 Page - Nordic Semiconductor