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How can i have virtual serial com port (for example com4 or com5 ...) using usb communication

I think its the cdc class to use on my pic18f4550 but how and how to know the number of the com port?...

how to calculate the number to write after pause to have a pause of 1 or 0.5 minute

the oscillator is at 48 mhz ? .

That realy helpful !

thanks very very much mackrackit .

thank you very much dude for your replay ...

but my problem is when learning the data sheet of max6675 i saw in specifecation that frequency maximum to work is 4.3

see datasheet max6675 page 3...

I want to make a serial communication --- 18f4550 and max6675 ---

but max6675 demand 4,3 mhz max to have the correct communication

how can i run my program on pic18f4550 at 4 Mhz

(the pic...