How Fast can a typical PORT Pin of a PIC Micro Switch from Low to High or 
vice versa... assuming the wire its connected to is short( maybe a few 
inches) and connected to another PIC Micro PIn...

i.e. if a Pin is Initially Low... and if I switch the PIN high and set it to 
Input immediately.. and read it back in the next instruction.. Will I be 
able to read the expected high level 1...

further more say its RA4 Pin with a Pull up resistor.. to turn it Low you 
clear TRISA4.. then In the next Instruction I turn the PIN high by setting 
TRISA4 to 1 making it an input.. and read it back immediately in the next 
instruction.. Will you I be able to read the expected Input which is a 1??? 
say if I was running the PIC at 40MHZ..

At what speed should I be watchfull??? 



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