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In a simple system it would be necessary to implement a local RTC, with battery removal check - once this would reverse the date. On a more robust system, you would need to have access to the world time server. By the way, I've done in the past a system that took advantage of the GPS to obtain the calibration of the system local date/time. This way it is possible to implement an expiration date for the program.This hex i will give my client and I want after 6 month this hex will not work
Hi,
Yes, as already said in post#7, you need add code (software).
It's your code that needs to decide whether it shoud run or not.
How does your customer program the code (hex file) onto the microcontroller? Interface, programming software
Klaus
You could consider to sell chip already programmed with 'lock bits' set to disable Further programming of the Flash and EEPROM. Then client couldn't workaround your timeout feature.