Deep power down mode in Power manager in LPC55S06

[Ramdev]

Hi,

I am using the LPC55S06 EVK kit

I am referring the lpcxpresso55s06_power_manager_lpc example code to understand the sleep and wakeup

 I checked the example code for deep power down mode. alarm was working fine.but RTC clock is getting reset.

Can anyone let me know why the RTC is being getting restarted??

Thanks

[RaRo]

Hello @Ramdev,

UM11424. LPC55S0x/LPC550x User manual. Section 13.3.6.6 Wake-up from deep-power down mode mentions: "The part goes through the entire reset process when a deep-power down wake-up event occurs:

• The PMU will turn ON the on-chip voltage regulator. When the core voltage reaches the Power-ON-Reset (POR) trip point, a system reset will be triggered and the chip boots.
• All registers will be in their reset state."

Best regards, Raul.

[Ramdev]

Hello Sir ,How to avoid the reset of the rtc,and instead the counts should continue ??
Thank you

[RaRo]

Hello @Ramdev,

As the UM11424. LPC55S0x/LPC550x User Manual mentions, the situation with the Deep-power down mode is that after a wake-up call a system reset will be triggered and the chip will boot causing that all registers to be in their reset state. And causing the RTC value/date not to continue but to restart.

Best regards, Raul.