Hi all:

I am trying communication between AT89c51 and Mouse.
First: I start to probe my serial routines with a HP48 calculator and it works fine, the calculator send a byte and microcontroller publish this date in a port.
Second : Now I want establish communication with this mouse and this hasn´t been posible.

The PS/2 mouse have four lines ( GND , +5 , Data , Clock), the clock line not make any signal, data line is input to RS232-IC from this to 89C51.

Someone could help me to understand the mouse signals for read data correctly?

PD:Excuse me for a litle English, my language native is spanish.