Pin 13 HIGH/LOW

[leetut]

Is it possible to use a micro controller to set pin 13 high or low
To access the internal programs?
I’ve tried and it always uses the eeprom

[frank]

Yes so if isn't working there is a problem with your design, you may need a pull-up.

[leetut]

I didn’t think I needed a pullup resistor because I’m sending either a definitive high or low to pin13

[frank]

Depends on how you have the port pin configured on the micro, are you sure it is actually driving high?

[leetut]

pinMode(PB4, OUTPUT); //fv1 pin13
digitalWrite(PB4, LOW); //high ext, low int

after checking with a multimeter pin PB4 is still high
must be something wrong with the pin, it wouldn't be the first time
at least I know it is possible to do, thank you