Parallel port programming using Silabs c8051f340

So you are already familiar with all the elements - then what additional information do you require?

"one more thing... USB Port "

Device, Host, or On-The-GO (OTG)?

"Keyboard (PS/2 or USB interface) "

The PS/2 protocol is well-documented - you should easily be able to find 8051 examples;

For USB, you would require a USB Host...

So you are already familiar with all the elements - then what additional information do you require?

"one more thing... USB Port "

Device, Host, or On-The-GO (OTG)?

"Keyboard (PS/2 or USB interface) "

The PS/2 protocol is well-documented - you should easily be able to find 8051 examples;

For USB, you would require a USB Host...

Thanks. I was looking for interfacing for USB and Parallel port together.

Can I use any ATMEL/AVR Microcontroller, that has following interfaces:
1) Two Serial RS232 port
2) one USB Port
3) One PS/2 Keyboard interface
4) One Parallel port interface for Printing data.

Thanks

"Can I use...
2) one USB Port"

Do you understand the difference between a USB Host (or "master") port, and a USB Device (or "slave") port?

Without that understanding, you won't get far using anything...