SparkFun Electronics Forum

I have a product with an old school user interface, using pots and switches. It's based on a 9s12C32.

I would like to make it p.c. programmable.

Does the FT232RL have a user area in the EEPROM that could store settings, replacing the pots and switches?

Is there a better way to do this?

Thanks for any help, ideas, etc.

JohnP

Whoa, the cover sheet excites me!

Thanks very much.

Hmm, doesn't look so good. User EEPROM varies from zero to not very much.

So far I have looked at an upgraded processor that includes EEPROM, but they are nearly double the price. Also looked at the 9s12XEG128. It's a dollar cheaper than what I am now using and it has Emulated EEPROM, but pages of code to implement.

Kept looking, saw a two terminal serial EEPROM, ground and a single wire. Looked good, but mas code.

Now looking at the MCP2200. USB bridge, EEPROM, and some GPIO. And low cost.

I've read there may be some driver issues, but these were not recent posts.

So far the MCP2200 looks the best. Any other choices I should look into? I don't know how much EEPROM I need, probably 20 bytes or so.

The 9s12XEG128 is looking better. According to AN3490, the pages of code shown in AN2302 (from '03) are now in firmware. And the chip appears to be pin compatible to the 9s12C32.