i am a beginner and iam using a 16f877A pic
my question is how i can take a username and a password from the user using a DTMF generator / DECODER , and to save this username and password using mikroC

 

Do you means that you want to save the username and password in the PIC?

PIC16f877A has internal eeprom. you can save the passwd/username in the eeprom.

May I know what is the output of DTMF generator? I never use it before

 

Why its DTMF, of course

Those touch tones you hear when dialing a landline telephone. Dual Tone Multi Frequency.

 

The output of the DTMF is a 4 bits binary number , i meant how can i save it "code wise" i cant get the sense of mikroC

 

You will need a DTMF decoder IC. That will "hear" the sounds and report them as a code you can use in the software.