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Thank you for the reply. The 1 meg resistor to cause delay with on time of the p channel mosfet . the diode connected across it bypasses the 1 meg resistor when driver pulls its output low causing the mosfet to turn off fast. the driver has a built in schmitt trigger which prevents noise and high frequency attacks to a large extend otherwise switching speed is not needed. the delay with the on time is needed to act as "soft start" for some other module which I have not mentioned in my design.

a microcontroller can be re-programmed within seconds with physical access but you cannot make a hardware do something that its not designed to . plus I can see the wiring in the circuits and the device ICs so I can tell is something has been changed. with a microcontroller you would have to go through the entire code to see what was changed. I have a workaround for that as well but its implementation will take time.

Thanks cheers