![]() will they know that they're not "meant" to be talked to? Side effects of the programming itself: are there other devices on the SPI bus? When the microcontroller is powered of, will these have a chip select line that is deasserted, i.e.Also, if the same power supply powers other components, what will happen? In essence, you'll have a hard time if the memory IC and the microcontroller run from the same power supply, and the microcontroller doesn't have an externally accessible reset pin. selective powering: Can you power the memory IC without starting the rest of the system? If giving power to that IC means you power the microcontroller it's connected to, and you have no way of stopping that microcontroller from using the SPI lines you want to connect to to talk to the memory chip, then this can't work.There's a lot of factors to that, but the ones I can think of are: So you're asking how to determine whether a chip can be in-system programmed.
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