NRF52811-QCAA-R datasheet(124/444 Pages) NORDIC

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Peripherals

The tasks and events are configured using the CONFIG[n] registers. Every set of SET, CLR and OUT[n] tasks

and IN[n] events has one CONFIG[n] register associated with it.

As long as a SET[n], CLR[n] and OUT[n] task or an IN[n] event is configured to control a pin n, the pin's

output value will only be updated by the GPIOTE module. The pin's output value as specified in the GPIO

will therefore be ignored as long as the pin is controlled by GPIOTE. Attempting to write a pin as a normal

GPIO pin will have no effect. When the GPIOTE is disconnected from a pin, see MODE field in CONFIG[n]

When conflicting tasks are triggered simultaneously (i.e. during the same clock cycle) in one channel, the

precedence of the tasks will be as described in Task priorities on page 124.

Priority

Task

OUT

CLR

SET

Table 40: Task priorities

When setting the CONFIG[n] registers, MODE=Disabled does not have the same effect as MODE=Task and

POLARITY=None. In the latter case, a CLR or SET task occurring at the exact same time as OUT will end up

with no change on the pin, according to the priorities described in the table above.

When a GPIOTE channel is configured to operate on a pin as a task, the initial value of that pin is

configured in the OUTINIT field of CONFIG[n].

6.9.2 Port event

PORT is an event that can be generated from multiple input pins using the GPIO DETECT signal.

The event will be generated on the rising edge of the DETECT signal. See GPIO — General purpose input/

output on page 115 for more information about the DETECT signal.

Putting the system into System ON IDLE while DETECT is high will not cause DETECT to wake the system

up again. Make sure to clear all DETECT sources before entering sleep. If the LATCH register is used as a

source, if any bit in LATCH is still high after clearing all or part of the register (for instance due to one of

the PINx.DETECT signal still high), a new rising edge will be generated on DETECT, see Pin configuration on

page 116.

Trying to put the system to System OFF while DETECT is high will cause a wakeup from System OFF reset.

This feature is always enabled although the peripheral itself appears to be IDLE, that is, no clocks or

other power intensive infrastructure have to be requested to keep this feature enabled. This feature can

therefore be used to wake up the CPU from a WFI or WFE type sleep in System ON with all peripherals and

the CPU idle, that is, lowest power consumption in System ON mode.

In order to prevent spurious interrupts from the PORT event while configuring the sources, the user

shall first disable interrupts on the PORT event (through INTENCLR.PORT), then configure the sources

(PIN_CNF[n].SENSE), clear any potential event that could have occurred during configuration (write '0' to

EVENTS_PORT), and finally enable interrupts (through INTENSET.PORT).

6.9.3 Tasks and events pin configuration

Each GPIOTE channel is associated with one physical GPIO pin through the CONFIG.PSEL field.

When Event mode is selected in CONFIG.MODE, the pin specified by CONFIG.PSEL will be configured

as an input, overriding the DIR setting in GPIO. Similarly, when Task mode is selected in CONFIG.MODE,

the pin specified by CONFIG.PSEL will be configured as an output overriding the DIR setting and OUT

value in GPIO. When Disabled is selected in CONFIG.MODE, the pin specified by CONFIG.PSEL will use its

configuration from the PIN[n].CNF registers in GPIO.

4454_140 v1.0

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