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The reason the data disappears after a few seconds, is the power supply capacitor still powers the chip long enough to keep the internal RAM alive.
I mean there can only be one address 0x?! I don’t know why that is??? But if you want to write to it, you have to the first of all erase it set all bits to 1. I mean isnt the flash data non volatile or did I get something wrong?
Only then you can write to it.
Actually you helped me a lot in making progress – I still have some weird problem left. I wrote a little Interface which stores Information in the non-volatile flash memory from the uC. Acording to datasheet of your CPU, to write you have to use special instruction.
Normaly, erasing done by sectors.
However I question your use of 0x for a Flash address to use for darasheet, that would normally be right in the middle of where your code is placed, unless you have modified your linker script. Toby 1, 10 36 Email Required, but never shown.
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Is there any way? Well the copying itself works well I looked up at the flash memory and it saved my data right – If I now disconnect my uC and connect it again in like 5 secs, the data is still there.
(PDF) C8051F340 Datasheet download
To copy my data there I just use memcpy. You can not just write to it.
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But if I leave it disconnected any longer my darasheet gets more or less “resetted” – that means it gets everytime almost the same “reset values”. Yea according to the datasheet I need to unlock it there is a procedure described there but how do I pick a destination? Based on the code you displayed in your question, you are trying to write to external data xdatawhich is RAM, not non-volatile flash memory.