LPC8N04 EEPROM endurance

kenchill — Wed, 17 Jun 2020 15:35:38 GMT

Hello

Are there any specifications for EEPROM or FLASH endurance for the LPC8N04 ?

All the data sheet gives is 10 year min data retention time for the EEPROM it gives no endurance or write times (the same goes for the FLASH).

We have a 32-bit counter that needs to reside in EEPROM which could be incremented once every 10 seconds over a life of 5 years, so some sort of wear-levelling algorithm needs to be used - but this is impossible without more info on the EEPROM.

There are a couple of other EEPROM issues:

(1) There is no info for setting the value in the RWSTATE and WSTATE wait registers, only magic numbers are given - will these values work for all clock speeds and temperatures or do they need to be scaled?

(2) The API won't work with a 500kHz clock - in table 8 of the user-manual it states that 500kHz is ok, but the API sets the CLKDIV to zero if this speed is selected causing a hardware exception - is this a bug in the API? the following is extracted from the 'EEPROM_Init()' function:

/* Set the clock divider */
clockDiv = sourceClock_Hz / FSL_FEATURE_EEPROM_INTERNAL_FREQ;
if ((sourceClock_Hz % FSL_FEATURE_EEPROM_INTERNAL_FREQ) > FSL_FEATURE_EEPROM_INTERNAL_FREQ / 2U))
{
clockDiv += 1U;
}
base->CLKDIV = clockDiv - 1U;

Thanks for any help

Ken...

Re: LPC8N04 EEPROM endurance

Alexis_A — Fri, 10 Jul 2020 15:59:49 GMT

Hello kenchill‌,

I've already reported the issue with the applications team, it looks like the EEPROM_Init should have the following condition:

if (base->CLKDIV < 1)
{
    base->CLKDIV = 1;
}

Best Regards,

Alexis Andalon

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