I am quite a novice working with microcontrollers. I am working on a small 8052 development board connected to a PC.

I have interfaced a 16x2 LCD (HD 44780) with a 8052 micro, in 8-bit mode, using Port1 as the data bits, and

P3.0 (RxD) as RS
P3.1 (TxD) as RW
P3.2 (_INT0) as EN

It is working almost fine.

I tried to input data using UART and display it on the LCD.

I used a Serial Interrupt to detect a keypress (enter), and then if the keypressed is "enter", i jumped on to an INPUT routine which inputs the data by polling RI flag.

also, when i press enter, i want to clear the LCD screen.

After detecting an interrupt due to RI, I reset RI, load SBUF to A, check whether t is "enter" and if it is, i jum to the INPUT routine, which first clearc the LCD screen and starts serial input.

problem is, after pressing the enter key, a juk character is being input as the first character, without any actual input from the keyboard.

the problem doesnt come if i remove the "clear screen" command.

I almost know that it's due to data on TxD and RxD pins, which are shared by the RS and RW lines of LCD. How do I eliminate it?

Hey! I just got an Idea that i can stop the Timer 1, which generates the baud rate for the UART. is it?

I will try.

Is there any other way?