mcf52259 internal ram battery backup?

[drummer]

I know that I read this somewhere but I can't find the reference for it.

A portion of the internal RAM is made non-volatile through the use of a battery connected to vstby.

I remember reading it somewhere. Does anyone know if it is the upper half or lower half that is retained?

Where is the reference for this information?

I am designing another product that may need to use this feature.

Thanks.

[TomE · Accepted solution]

Open the Reference Manual. Type "Control-F", search for "standby" and the first match will tell you.

Tom

[drummer]

Thanks I knew I read it somewhere

• On-chip memories

— Up to 64-Kbyte dual-ported SRAM on CPU internal bus, supporting core, DMA, and USB

access with standby power supply support for the first 16 Kbytes

.