thanks ijaz for ur kind help to me , i hv hd done one bfo type with 2313 avr , this was desiged by a russien guy , but two factor are making problems one stablity/sensitivet , secondly in my country high speed avr are not available i got just one 2313-4pi i need 10 to 15 pi, any way , b4 starting a new project i alwase try to get enough information for that , so i called friends for help , im a silent user of this fourm , i hvnt much expireance but i like to share info with others,
now im going to designe one pi type i hope it will work good .. yes i agree with u ,we can put microcontroller any where in any designe , but i like to minimaiz the designe ,and i believ that a single micro can done the job with just few component out side and we can get all by software is it or not !? hv u ever worked with digital filteration for 8051?

thanks again

fk