the Power Off flag in original Intel 80C52 is set only when power rises form 0V to 5V
This way one can distinguish between a cold restart and a warm restart
I used an Atmel 89C52 and surprise ;
the POF bit was also set in a warm restart,i.e. when the power is kept during reset by watchdog.
This means Atmel is not fully compatibel to original Intel.

Why is this so ?
Is there not a POF bit in Atmel parts ?