Hello,
I have found a NOS stash of ST62E28 ROM MCUs. Out of curiosity, does anyone have a documentation how these were programmed? I can google the name of the tool, heck I could even find one with the software to run it, but I am more interested how the programming interface was done on these old MCUs.
I have a
ST62E28CF1 (datasheet), which is a cerdip with UV erasable ROM inside. From the datasheet that can be easily found on google, I can clearly see there is a 12.5V Vpp pin. However I do not see any further description how is the data transfered inside.
Have anybody used these 8bit oldtimers?
Thanks
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)