ISCP programming while SPI device connected

Hi all,

I got the following question: how to program a 328P through ISCP while having SPI device connected to it ? (a screen for example..). I m currently designing a PCB sheet and I do not plan to have a USB plug. On my prototype I m using a Minipro that I can program using RX TX (Trough an UNO as ISP...) to do the updates .. but that's because the bootloader is already inside: To what I understood it will not work for a "blank" 328P.
I m thinking using jumpers to disconnect the screen during the programming, but I m afraid of bad connections du to those jumpers ... any other suggestions?
Thx for your help,
lenoyl

SCK and MOSI should not be a problem if you are using those as outputs to other devices,
If you have the chip select of other devices pulled high to disable (or low, depending on the device), then MISO should not be a problem.

You can use solder jumpers to completely isolate the signals, and then bridge them with a touch of solder when you are done programming. No wires needed.

ok thx for the advice!

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