AVR-Chat

how to connect 2 AVR with out serial 
for Example :
PORTD of AVR1 ==  Sending data
PORTD of AVR2 == Resiving data   XXXXXX
===============================
8 bit parallel: Need to send on one port and receive on another, also need  
handshake lines
Or use SPI if distance is not too great
Or use 1 output and 1 input and 'bitbanging'... can be either full duplex  or 
half duplex
 
 
 





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