J. Guy wrote:
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My data sheet does not have the words "sampled" and "released", so you must be looking at something else.

thanks for your answer,

Ok sampled is not there but on page 98
(Hardware activation of the bootloader) I can read the following:
User application should take care to release hardware conditions
(PSEN LOW, EA HIGH) 24 clock cycles after falling edge of reset signal.

Cheers
Thomas