S12G240 minimun Voltage for RAM Retention

[alessandro_sera]

Hello,

my application must detect if a RESET occurs and must be immune to some specified voltage drop.

I would use a dedicated pattern stored in RAM_NO_INIT: even if a reset occurs, this RAM area will not be re-initialized at Startup and will be used as a flag to inform about the state before the reset or the voltage drop.

The question:

what is the mimimun voltage which ensure the data in RAM are not erased?

Thank you very much!

Alessandro

[iggi]

Hi Alessandro,

the minimum voltage is the assert level of Power On Reset (POR). This level is not specified in the documentation as the value cannot be exactly determined, but it is around 1.2V. As far the supply voltage is kept above this level, the POR would not happen.

You can check the PORF flag in CPMUFLG register of S12CPMU module after reset to ensure (PORF is set to 1 when a power on reset occurs).

Regards,

iggi