NRF9160-SICA-R7 datasheet(107/400 Pages) NORDIC

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Peripherals

An event can be generated in each GPIOTE channel from one of the following input conditions:

• Rising edge

• Falling edge

• Any change

6.5.1 Pin events and tasks

The GPIOTE module has a number of tasks and events that can be configured to operate on individual

GPIO pins.

The tasks SET[n], CLR[n], and OUT[n] can write to individual pins, and events IN[n] can be generated from

input changes of individual pins.

The SET task will set the pin selected in GPIOTE.CONFIG[n].PSEL to high. The CLR task will set the pin low.

The effect of the OUT task on the pin is configurable in CONFIG[n].POLARITY. It can set the pin high, set it

low, or toggle it.

Tasks and events are configured using the CONFIG[n] registers. One CONFIG[n] register is associated with a

set of SET[n], CLR[n], and OUT[n] tasks and IN[n] events.

As long as a SET[n], CLR[n], and OUT[n] task or an IN[n] event is configured to control 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 be ignored as long as the pin is controlled by GPIOTE. Attempting to write to the pin as a normal GPIO

pin will have no effect. When the GPIOTE is disconnected from a pin, the associated pin gets the output

and configuration values specified in the GPIO module, see MODE field in CONFIG[n] register.

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

priority of the tasks is as described in the following table.

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, based on 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].

6.5.2 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 97 for more information about the DETECT signal.

The GPIO DETECT signal will not wake the system up again if the system is put into System ON IDLE while

the DETECT signal is high. Clear all DETECT sources before entering sleep. If the LATCH register is used as

a source, a new rising edge will be generated on DETECT if any bit in LATCH is still high after clearing all

or part of the register. This could occur if one of the PINx.DETECT signals is still high, for example. See Pin

sense mechanism on page 99 for more information.

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

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