ICP via optocouplers?

[Norbert]

Pedja - very instructive video!
Since there is an onboard 1Mbit FRAM on the hardware that could be used for the intermediate storage of the serially-uploaded code, I'll give it a try. Thanks for the suggestion and your code - I think I get the general drift of it.

On this thread [URL="http://www.picbasic.co.uk/forum/showthread.php?t=10144 "], BradB suggests setting a flag in EEPROM for bootloader/no bootloader at next reset. That sounds useful too, to avoid having to catch the bootloader in time after reset, which can be timing critical - as per your suggestion, Dave.

And a little too late, a thankyou to DarrelT who in an old thread suggested RTFM and @ RESET...

[Art]

Hi One way to reset would be to clear the watchdog timer yourself,
and jump to an endless loop that fails to clear it.

Serial over a Toslink cable would give the 10 kV isolation.
I've found 0.2uF capacitance across the Toslink receiver
output to ground (instead of a cap in series used for digital audio)
overcomes the receiver's clock jitter, and allows the DC serial signal.