GRTC Feature of nRF54L15

[Irfan Memon]

Hi

I have couple of questions,

GRTC work as RTC (Real Time Clock)?

If yes then why there are three dedicated pins? (P0.03,P0.04,P1.08)  means we can use it at outside ?

What hardware need to connect externally if want to use GRTC?

Thanks & Regards,

Irfan

[tesc]

Hi,

GRTC, as the RTC peripherals for the nRF51, nRF52 and nRF53 series, is a Real Time Counter (not to be confused with Real Time Clock.) It is essentially a timer.

GRTC can relay the clock signal from either the LFCLK (32 KHz clock) or divided clock based off of the 16 MHz clock, to the respective dedicated pin. If you have a separate device running off of that clock signal or otherwise counting the pulses, then you could keep track of time that way. Please note then, that unlike a Real Time Clock, the Real Time Counter does not directly provide any means to output the current counter value to external devices, so in order to provide time to other devices you would have to keep track of time on the nRF54L and communicate that time through other means.

The third pin dedicated for the GRTC is for PWM output, which is also part of the capabilities of the GRTC peripheral.

See GRTC - Global real-time counter in the NRF54L15 datasheet for full documentation for the GRTC peripheral.

Regards,
Terje