pic 16f677 programming in machine language

hi, I am a newbie to PIC chip programming... my next venture would be to use a buzzer connected to a 16f677 chip, to play ringtones of any sort.. mostly using changing frequencies and time periods. Can someone please give me a link to any tutorial which will let me get the required data............ i have already gone through the basics of programing. Am programming in machine language..

Thank you..

Toggle a port pin at audio rates using software loops as delay generators? Or use TIMER0, 1 or 2 to generate the delays?

Hello

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Thannk guyz... will be sure to try those out....