±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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But if you want to write to it, you have to the first of all erase it set all bits to 1. 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 Section 12 of the datasheet.

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. Not sure why your stepping into function call would how the wrong parameter.

Normaly, erasing done by sectors. Based on the code you displayed in your question, you are trying to write to external data xdatawhich is Datashfet, not non-volatile flash memory.

I mean isnt the flash data non volatile or did I get something wrong? You c051f340 not just write to it. I wrote a little Interface which stores Information in the non-volatile flash memory from the uC. Is there any way?


c – Flash Memory in F Microcontroller gets erased – Stack Overflow

Email Required, but never shown. Maximum that you can – read from it as from normal memory only if you have NOR flash.

Sign up using Facebook. You should pick an address toward the top of your flash memory, like 0xF Down there I tried to implement the example for the F into my code.

I mean there can only be one address 0x?! I have can CF Microcontroller from Silabs.


Actually you helped me a lot in making progress – I still have some weird problem left. To copy my data there I just use memcpy. Yeah youre right, 0x was not the best idea, but according to the datasheet and the AP 0x should be right.

I don’t know why that is??? Okay that link to the application note from silabs helped. They called erase sectors. I use the example functions from the AP for the F If I call the function like its designed it doesnt work – if I make a global variable to “pass” the function arguments it works Now as in the data sheet described I save all the data in between the addresses 0x – 0x See datasheet of your microcontroller about their size.

Toby 1, 10 36 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 cc8051f340 it again in like 5 secs, the catasheet is still there. Make sure that memcpy internally use it. 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”.


Acording to datasheet of your CPU, to write you have to use special instruction.

Post as a guest Name. Stack Overflow works best with JavaScript enabled. Yea according to the datasheet I need to unlock it there is a procedure described there but how do I pick a destination?

Datashdet then you can write to it. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Sign up using Email and Password. 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. Re your question re the MOVX instruction, the app note says: 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.