problems changing the file in the microcontroller

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#1
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hello guys, long time ago i didnt connect. I have been...veeery busy.

i have been remembering the stuff that i learnt a year ago. but i am having new problems.

i am using the decanbots evelopment board with in system program port. in my proyects i have been using P port of the micro atmega16 to connect it to a uln280 driver inputs or to an lcd port.

the problem is that everytime I am charging the file i need to disconnect the B port from the other hardwares, if not the program load crashes.
is it normal...or my micro is starting to die?

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This is completely normal.

The ISP lines are on PORTB. If your hardware is connected and NOT in 3-state then the ISP will be unreliable.

David.

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aha.

thanks david.