NRF52811-QCAA-R datasheet(341/444 Pages) NORDIC

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Peripherals

The Counter register can be cleared, that is, its internal value set to zero explicitly, by triggering the CLEAR

task.

The TIMER implements multiple capture/compare registers.

Independent of prescaler setting the accuracy of the TIMER is equivalent to one tick of the timer

frequency fTIMER as illustrated in Block schematic for timer/counter on page 340.

6.24.1 Capture

The TIMER implements one capture task for every available capture/compare register.

Every time the CAPTURE[n] task is triggered, the Counter value is copied to the CC[n] register.

6.24.2 Compare

The TIMER implements one COMPARE event for every available capture/compare register.

A COMPARE event is generated when the Counter is incremented and then becomes equal to the

value specified in one of the capture compare registers. When the Counter value becomes equal to the

value specified in a capture compare register CC[n], the corresponding compare event COMPARE[n] is

generated.

BITMODE on page 345 specifies how many bits of the Counter register and the capture/compare

6.24.3 Task delays

After the TIMER is started, the CLEAR task, COUNT task and the STOP task will guarantee to take effect

within one clock cycle of the PCLK16M.

6.24.4 Task priority

If the START task and the STOP task are triggered at the same time, that is, within the same period of

PCLK16M, the STOP task will be prioritized.

6.24.5 Registers

Base address

Peripheral

Instance

Description

Configuration

0x40008000

TIMER

TIMER0

Timer 0

This timer instance has 4 CC registers

(CC[0..3])

0x40009000

TIMER

TIMER1

Timer 1

This timer instance has 4 CC registers

(CC[0..3])

0x4000A000

TIMER

TIMER2

Timer 2

This timer instance has 4 CC registers

(CC[0..3])

Table 101: Instances

Offset

Description

TASKS_START

0x000

Start Timer

TASKS_STOP

0x004

Stop Timer

TASKS_COUNT

0x008

Increment Timer (Counter mode only)

TASKS_CLEAR

0x00C

Clear time

TASKS_SHUTDOWN

0x010

Shut down timer

Deprecated

TASKS_CAPTURE[0]

0x040

Capture Timer value to CC[0] register

TASKS_CAPTURE[1]

0x044

Capture Timer value to CC[1] register

TASKS_CAPTURE[2]

0x048

Capture Timer value to CC[2] register

4454_140 v1.0

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NRF52811-QCAA-R Datasheet(PDF) 341 Page - Nordic Semiconductor

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