LPC55S69: reinitialization RNG after PowerDown

[EugeneHiihtaja]

Hi !

Should I reinitialize RNG peripheral after PowerDown mode ?

I can see initialization function of it :

void RNG_Init(RNG_Type *base)
{
/* Clear ring oscilator disable bit*/
PMC->PDRUNCFGCLR0 = PMC_PDRUNCFG0_PDEN_RNG_MASK;
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
CLOCK_EnableClock(kCLOCK_Rng);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
}

Are enable RNG  in PMC and Clock only and those registers retains while PowerDown.

It can be similar situation with HASHCRYPT but at list there some reset need to be executed :

void HASHCRYPT_Init(HASHCRYPT_Type *base)
{
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
CLOCK_EnableClock(kCLOCK_HashCrypt);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
RESET_PeripheralReset(kHASHCRYPT_RST_SHIFT_RSTn);
}

Regards,

Eugene

[FelipeGarcia]

Hello Eugene,

In power-down mode, only some critical peripherals like the security controller are retained, internal SRAM values can be maintained, and the logic levels of the pins remain static. RNG module is not retained by power-down mode.

Best regards,

Felipe

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