[245TurboT5]

ric355 what car is this on?

[JHolland]

As ric355 says Its the number of write cyles that is limited, ie the number of write/erase cycles, however, its the erase operation that wears the memory. A common technique is to allocate a block of memory to one parameter and then continually increment the write addrress, erasing the block only when its full. You can either maintain a pointer to the address, which requires its own management or simply reset a volatile pointer on each start up by reading backwards through the memory to find the first non-blank address, erased addresses contain FFh.
You will need a recovery method in the event of a power down mid-write/erase.

[ric355]

ric355 what car is this on?

TVR Chimaera

[245TurboT5]

Lovely!

[PSIG]

You will need a recovery method in the event of a power down mid-write/erase.

I've seen that handled by maintaining power until the routine is complete. With a power-on input, the board functions normally. When the power-input goes low (key-off) the system stops looping the routine and delays long enough for the routine to finish on keep-alive power (KP or KAP); or maintains the switched-power relay energized until the routine signals it's done, then de-energizes the relay for power-down. I'm sure there are other creative ways to avoid corruption from power-off during the routine, and my curiosity would be interested to hear more of them.

David