[PIC] two pic communication

[MODCHIP]

hi all

there is a small machine that work with two pic's and they have communication between these two pic's
communication like

the 57a with 7 segment display and button i already do the prog for those componant
and the 72a phase control and reading tacho for speed

so the type of communication is like to send button command like start and stop from the display picto the other one to start the motor or stop

and in the other hand the pic in the power board need to send for exemble the tacho speed and other information

so the problem of this equipement is the 16c72a is short circut in vcc and gnd and the tow pic's are code protected so i try to make something like the reverse ingeniring

i m stuck on how the designer make the communication betwen thes two pics




any one help please
thank you

 

[PA3040]

hi all


so the problem of this equipement is the 16c72a is short circut in vcc and gnd and the tow pic's are code protected so i try to make something like the reverse ingeniring

thank you

I think this PIC's are OTP

Is this your own design or else design and with out proper hardware design we can not reply

 

[horace1]

Using an oscilloscope or analyser to examine the signals may then give you some ideas

 

[MODCHIP]

Than you for replay
i try using pickité for the display bord but the other pic have a short circuit in vcc and gnd


AND FOR THE DESIGN QUESTION it is not my design cause i m trying to repair the equipement