On driving one PIC from another:  One PIC normal port pin can drive
another directly (20mA usually source/sink limit, total of all loads,
and usually a per-port total sink or source limit.)  Easily.  Don't try
this with the OSC1 / OSC2 pins unless you know what you're doing though
<G>  And don't exceed those per-pin and per-port limits, generally not
good ideas to do that.

It's not a bad idea to put a small series resistor between these - for a
variety of reasons, one good one being that if you accidentally drive
one PIC's pin as a low output and the other pin as a high output, the
resistor helps keep both PICs safe (PICs are pretty hard to kill;  it's
a good habit as not all circuitry are as sturdy.  Mainly something to
remember and consider on other circuitry.)

  Mark

gustavo bankuti wrote:
> Hello,
>
> I have one system using PIC16c621a, I need to connect
> to another system using PIC16c56. On the 16c621a,
> there are some pins used as signals to lit LEDS. Can I
> connect the pins of the PIC16c56 directly to the pins
> of the PIC16c621a ?
>
> Do I need some 'amplifier' or does the pic16c621a is
> capable of driving the other pic ?
>
> I am using a C compiler, and the ports are kept on the
> STANDARD mode, should I change this ?
>
> Thanks ,
>
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