LPC55S69: reinitialization RNG after PowerDown

EugeneHiihtaja — Wed, 04 Mar 2020 08:02:24 GMT

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

Re: LPC55S69: reinitialization RNG after PowerDown

FelipeGarcia — Tue, 10 Mar 2020 21:07:13 GMT

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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topic Re: LPC55S69: reinitialization RNG after PowerDown in LPC Microcontrollers

LPC55S69: reinitialization RNG after PowerDown

Re: LPC55S69: reinitialization RNG after PowerDown