±1 LSB INL; no missing codes. – Programmable throughput up to ksps. – Up to 17 external inputs; programmable as single-ended or. CF Datasheet PDF Download – Full Speed USB Flash MCU, CF data sheet. Explore the latest datasheets, compare past datasheet revisions, and confirm part lifecycle. Preview and Download. Download Datasheet CF
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Now as in the data sheet described I save all the data in between the addresses 0x – 0x To copy my data there I just use memcpy. 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.
But if I leave it disconnected any longer my data gets more or less “resetted” – that means it gets everytime almost the same “reset values”. I mean isnt the flash data non volatile or did I get something wrong? 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.
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. To write to flash datssheet, you need to follow a specific protocol to unlock the flash programming circuitry, then erase the area you will be writing to, and then write the bytes using MOVX instructions as described in Section 12 of the datasheet. You can not just write to it. Maximum that you can – read from it as from normal memory only if you have NOR flash.
But if you want to write to it, you have to the first of all erase it set all bits to 1.
Only then you can write to it. Normaly, erasing done by sectors. They called erase sectors. See datasheeh of your microcontroller about their size. Acording to datasheet of your CPU, to write you have to use special instruction.
Toby 1, 10 36 Yea according to the datasheet I need to unlock it there is a procedure described there but how do I pick a destination? I mean there can only be one address 0x?!
Is there any way? Okay that link to the application note from silabs helped. Down there I tried to implement the example for the F into my code. Re your question re the MOVX instruction, the app note says: Not sure why your stepping into function call would how the wrong parameter. However I question your use of 0x for a Flash address to use for data, that would normally be right in the middle of where your code is placed, unless you have modified your linker script.
You should pick an address toward the top of your flash memory, like 0xF Yeah youre right, 0x was not the best idea, but according to the datasheet and the AP 0x should be right. Actually you helped me a lot in making progress – I still have some weird problem left. I use the example functions from the AP for the F It compiles without problems, but like i already said, it has problems with passing the function parameters If I call the function like its designed it doesnt work c8051g340 if I make a global variable to “pass” the function arguments it works I don’t know why that is???
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cf datasheet & applicatoin notes – Datasheet Archive