Help for 89c2051 circuit assembly

Thread Starter

Parv Bhavsar

Joined Apr 12, 2016
I am working on my circuit in which I am using a 89c2051 controller.
On PCB I have connected following pins to controller
2)Xtal1 & xtal2 to oscillator and capacitors
3) GND
4) All those 4 port pin that I am using to trigger transistors
Now my question is do I need to do something to RST or any other pin,
Or just live them open circuited...?
Thank You in advance.


Joined Feb 19, 2010
"Reset input. All I/O pins are reset to 1s as soon
as RST goes high. Holding the RST pin high for
two machine cycles while the oscilla
tor is running resets the device.
Each machine cycle takes 12 oscillator or clock cycles."

Since you don't know where your Reset is floating (high or low), you want to give it a defined value. Since you don't want the device constantly reset, you want it connected to ground.