Quote Originally Posted by shahidali55
Is there a 100% pin and software compatible one time programmable pic to the 16F84A ???
We could just talk about the 16CR84 ... but programming must be done ... at factory ( ROM memory ), and min. quantities compulsory.


Now, I do not see your reason, but using the "code protect" option can avoid some ... forbidden use ( reading ) of the chip.

the re-use of the chip finally leads to program a brand new chip ...

Speaking costs OTP products are as expensive as Flash ones ... the cost difference is for Windowed devices ( UV Erasable )

Alain

PS: Even OTP device programs can be modified ( "1"s can be overwritten by "0"s ) ... do not repeat it !!!