NRF52820-QDAA-R datasheet(301/437 Pages) NORDIC

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Peripherals

The Counter register can be cleared by triggering the CLEAR task. This will explicitly set the internal value

to zero.

TIMER implements multiple capture/compare registers.

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

fTIMER as illustrated in Block schematic for timer/counter on page 300.

6.21.1 Capture

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.

6.21.2 Compare

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 305 specifies how many bits of the Counter register and the capture/compare

6.21.3 Task delays

After TIMER is started, the CLEAR, COUNT, and STOP tasks are guaranteed to take effect within one clock

cycle of the PCLK16M.

6.21.4 Task priority

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

PCLK16M, the STOP task will be prioritized.

6.21.5 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])

0x4001A000

TIMER

TIMER3

Timer 3

This timer instance has 6 CC registers

(CC[0..5])

Table 91: 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

4463_156 v1.0

301

NRF52820-QDAA-R Datasheet(PDF) 301 Page - Nordic Semiconductor

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