y people here r so rude instead of helping ...anyways...Mr.Adnan here is a piece of advice

About your Registrar Issue, i think if you use book "The 8051 Microcontroller by Scott Mackenzie" all your basic questions will be cleared when ever you are writing a code and having trouble using a instruction move to its page 247 which has instruction details.

About your problem of increment , according to page 281 of this book , the INC commands resets when it reaches its final value of 255 i.e. 0FFH. as stated in the book .. INC : increments the indicated variable , AN original value of 0FFH overflows to 00H.


Next about storing large values , the trick is to understand the user ram locations, and internal bitwise area , how to use that, once you understand that you can do any thing. Plz write what actually was want to acheive then may be i can help.