Hello, I want to design a TFT Evolution board for my two types of TFT and Touch Panel. But to control the bidirectional (Read & Write) line on my cpu, I need a circuit that will allow me to turn it on/off. Do you have any suggestions for this?

 

Hello, I want to design a TFT Evolution board for my two types of TFT and Touch Panel. But to control the bidirectional (Read & Write) line on my cpu, I need a circuit that will allow me to turn it on/off. Do you have any suggestions for this?

What CPU?
What Read & Write line?
Why do you think it is bidirectional?

 

I am sorry about that. I am using dsPIC33EP256MU810 on my motherboard. I want to use a pin for interrupt to control the capacitive touch screen interrupt pin. But sometimes I use this pin as an output, and sometimes I want to separate the pin of my processor from this structure and make it idle. So I need a control circuit to control my bidirectional path (This line will be used for two types of pins-> input and output)

 

I am sorry about that. I am using dsPIC33EP256MU810 on my motherboard. I want to use a pin for interrupt to control the capacitive touch screen interrupt pin. But sometimes I use this pin as an output, and sometimes I want to separate the pin of my processor from this structure and make it idle. So I need a control circuit to control my bidirectional path (This line will be used for two types of pins-> input and output)

I'm having trouble visualizing what you are talking about. Words are nearly useless when it comes to describing circuits.
A general solution for having one processor pin that can handle 2 inputs and 2 outputs would be four tristate buffers. Something like this:



ONLY one of the enable signals should be low at one time and you would also have to configure the uP_Pin properly. If you truly want bidirectional I/O you can enable one input buffer and 1 output buffer.

 

Have you even tried to read the description of the IO pins in the datasheet? I would start there.

 

Words are nearly useless when it comes to describing circuits.

Rear Admiral Joshua Painter agrees with you. Engineers don't take a dump, son, without a schematic.

ak

 

Fred Thompson, the actor who played Admiral Painter, was a United States Senator. I think that aphorism goes for him too.

 

Thank you very much for your help. I figure it out with a two way buffer. Thank you