Thank you Dear Forum Members,
The replies were pretty quick, I was not ready for such quick replies. Thanks.

Mr. RajWrote:
In fact most of the 8051 demo. boards work this way...the monitor program is placed in the internal memory and the user program is place in the external memory.

My reply:
What you said is true, but the User Program is always outside the Address Space of the Monitor Program (I think so). Example: IROM: 0x0000 to 0x1fff.
User ROM: any address above 0x2000.
What I wanted was overlapping address space. Example : IROM 0x0000 to 0x3fff
User ROM:0x0100 to 0xffff.


To Mr. Charles,
1.Thanks Mr. Charles for the Link. I will study it in more detail and will reply.
2. Why does it show that I an unregistered User, whereas I have already registered,
and recieving regular mails from 8052.com
3. I had also selected "Forgot Password". got the password by mail, entered the same
password, but it says "incorrect Password.
4. I dont see the UserName when I am entering the password. ( I may doing something
really silly, Forgive me if it is so.)

To Mr. Erik,
I will go through the datasheets of RB2 and RC2 in detail.

Mr. Menno wrote:
Mr. Sutar uses a Philips device, so I believe that it is best to look in the Philips datasheet.
My Reply:
Thanks. I am already referring to datasheets of Ics I am using. That is what I have mentioned in the start of this thread.

Mr. J Guy wrote:
But I wonder why peripheral Initialization is going to be so protected. Is this to prevent tinkering with known working code ?
My reply:
As I stated in the beginning of this thread, that, IROM code will be written by me. And I want it secure so that no one fiddles with it. Also I don't want the Lower Level programmers to go into hardware details of configuring hardware or accessing them directly. Something similar to an Operating System in Computers. So later even if I change the CPU, or any hardware specs, the user program need not be changed.


Thanks to all of you for sending the replies.

Kiran V. Sutar.