Answer Posted / walter

Both. For example a 511 uP has a specific part of it set
aside that is typically not overwritten to instruct it how
to boot, or how to reset after a power failure. It has to
do with interrupts. There are 8-10 memory locations that
have 4-5 addresses (each address is 2 bytes and each
location is only one byte). Each of these addresses
corresponds to the specific type of interrupt in question.
Each of these addresses contains the first instruction of
the set of instructions that is the program for that
interrupt. When the interrupt happens, the processor jumps
to this address and starts executing the code. Often this
code is not overwriten, thus the ROM philosophy, but it
often can be. Different uP have their own different
implementations, so this may not always be the norm. I
guess you could call this a grey area, and a good question
at that.

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