±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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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.

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 c8051g340 in like 5 secs, the data is still there. Down there I tried to implement the example for the F into my code. Sign up using Email and Password. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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. Stack Overflow works best with JavaScript enabled. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


But if you want to write to it, you have to the first of all erase it set all bits to 1. To copy my data there I just use memcpy.

Okay that link to the application note from silabs helped. Acording to datasheet of your CPU, to write you have to use special instruction.

Email Required, but never shown. 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 I have can CF Microcontroller from Silabs. Only then you can write to it. Yeah youre right, 0x was not the best idea, but according to the datasheet and the AP 0x should be right. Normaly, erasing done by sectors. To write to flash memory, 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 Dataeheet 12 of the datasheet.

Sign up or log in Sign up using Google. Post as a guest Name. 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 Datasheett get something wrong?


Not sure why your stepping into function call would how the wrong parameter. Re your question re the MOVX instruction, the app note says: Make sure that memcpy internally use it. I wrote a c805f1340 Interface which stores Information in the non-volatile flash memory from the uC.

(PDF) C8051F340 Datasheet download

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. Maximum that you can – read from it as from normal memory only if you have NOR flash. Now as in the data sheet described I save all the data in between the addresses 0x – 0x Is there any way?

If I call the function like its designed it doesnt work – if I make a global variable to “pass” the function arguments it works I datashewt there can only be one address 0x?!

It compiles without problems, but like i already said, it has problems with passing the function parameters You should pick an address toward the top of your flash memory, like 0xF You can not just write to it. Yea according to the datasheet Datashheet need to unlock it there is a procedure described there but how do I pick a destination? They called erase sectors. I don’t know why that is???

See datasheet of your microcontroller about their size. Toby 1, 10 36 Sign up using Facebook.