wuchy143
Member
Hi All,
I have exhausted the datasheet and am being ignored by Atmel currently so I figured I'd check on here if anyone had the information I need.
My problem is that I have an 89S52 microhttps://www.keil.com/dd/docs/datashts/atmel/at89s52_ds.pdf and I'm driving an LED(1 mA of current) on the P3.3 port pin. It's one of the interrupt pins but was the only one available for me to use in my design. When I do this the port pin p3.3 can only drive up to about 3V. Then when I disconnect the bias resistor it's able to drive to 5V just fine.
It says in the datasheet that port 3 is capable of sourcing/sinking current. Though, I couldn't find the max current it can supply. I think I may not be able to provide the correct current to the LED which is then bringing my voltage down to 3v but would like to know more about the 89S52 before I can say that for sure. Anyone know anything about port 3?
Thanks
-mike
I have exhausted the datasheet and am being ignored by Atmel currently so I figured I'd check on here if anyone had the information I need.
My problem is that I have an 89S52 microhttps://www.keil.com/dd/docs/datashts/atmel/at89s52_ds.pdf and I'm driving an LED(1 mA of current) on the P3.3 port pin. It's one of the interrupt pins but was the only one available for me to use in my design. When I do this the port pin p3.3 can only drive up to about 3V. Then when I disconnect the bias resistor it's able to drive to 5V just fine.
It says in the datasheet that port 3 is capable of sourcing/sinking current. Though, I couldn't find the max current it can supply. I think I may not be able to provide the correct current to the LED which is then bringing my voltage down to 3v but would like to know more about the 89S52 before I can say that for sure. Anyone know anything about port 3?
Thanks
-mike