NRF9160-SICA-R7 datasheet(54/400 Pages) NORDIC

54 / 400 page

Power and clock management

Clock and oscillator control unit

LFCLKSTOP

HFCLKSTART

LFCLKSTART

HFCLKSTOP

LFCLKSTARTED

HFCLKSTARTED

LFCLK

clock control

HFCLK

clock control

LFRC

RC oscillator

LFXO

oscillator

HFXO

oscillator

(high accuracy)

PCLK32KI

PCLK1M

PCLK16M

PCLK32M

HCLK

CLOCK

LFCLKSRC

HFCLKCTRL

HFINT

oscillator

(low accuracy)

Figure 11: Clock and oscillator setup

5.1.4.1 HFCLK clock controller

The HFCLK clock controller provides several clocks in the system.

These are as follows:

• HCLK: 64 MHz CPU clock

• PCLK1M: 1 MHz peripheral clock

• PCLK16M: 16 MHz peripheral clock

• PCLK32M: 32 MHz peripheral clock

The HFCLK controller uses the following high frequency clock (HFCLK) sources:

• 64 MHz oscillator (HFINT)

• 64 MHz high accuracy oscillator (HFXO)

For illustration, see Clock and oscillator setup on page 54.

The HFCLK controller will automatically provide the clock(s) requested by the system. If the system does

not request any clocks from the HFCLK controller, the controller will switch off all its clock sources and

enter a power saving mode.

The HFINT source will be used when HFCLK is requested and HFXO has not been started.

The HFXO is started by triggering the HFCLKSTART task and stopped using the HFCLKSTOP task. A

HFCLKSTARTED event will be generated when the HFXO has started and its frequency is stable.

5.1.4.2 LFCLK clock controller

The system supports several low frequency clock sources.

4418_1315 v2.0

NRF9160-SICA-R7 Datasheet(PDF) 54 Page - Nordic Semiconductor

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