ST7FLITE10 and output state on startup.

y2399 · ‎2006-03-01

Posted on March 01, 2006 at 11:15

y2399 · ‎2006-01-02

Posted on January 03, 2006 at 04:46

I come back with my application on ST7FLITE10F1M6. Now, the programm seems to run OK but there is still an little problem with two output.

In fact, my A port is used as output except for 2 lines that I leave floating.

At the startup of the mCU I can see that 2 of the 6 outputs (PA0 and PA4) are at the high level for 400ms. I don't understand what occurs. Is there a solution to avoid this problem ?

Thanks in advance for your help.

laurent239955_stm1 · ‎2006-01-03

Posted on January 03, 2006 at 09:37

Hi,

At reset, all the I/Os are configured as inputs, so there is no reason these two pins are driven high. Are you sure they are really driven high ? Try to add a pull-down resistor !

Are these two pins, the ones configured in floating inputs ?

BR

Laurent

y2399 · ‎2006-03-01

Posted on March 01, 2006 at 11:15

I found my problem. In fact, I was reading the input state too early. My programm have to put these two output at high state if an input is low state and this input is low state for a few ms at board startup. A temporization has solved this problem.