Parallel port programming using Silabs c8051f340

Are you already familiar with the parallel port itself?

Yes

Are you already familiar with the Silabs C8051F340/1/2 etc?

I am familiar with Silabs C8051F020.

Are you already familiar with 8051 development in general?

Yeah.

Please Let me know one more thing...

I want to connect A parallel port, USB Port and Keyboard (PS/2 or USB interface) to C8051F020, which protocol (e.g SPI,I2C etc) will be needed to interface these?
I know C8051F340/1/2 etc has inbuilt USB, but still want to use C8051F020.

Are you already familiar with the parallel port itself?

Yes

Are you already familiar with the Silabs C8051F340/1/2 etc?

I am familiar with Silabs C8051F020.

Are you already familiar with 8051 development in general?

Yeah.

Please Let me know one more thing...

I want to connect A parallel port, USB Port and Keyboard (PS/2 or USB interface) to C8051F020, which protocol (e.g SPI,I2C etc) will be needed to interface these?
I know C8051F340/1/2 etc has inbuilt USB, but still want to use C8051F020.

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...