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will u please tell me about int of c51
If we assume this is about the Intel 8051 architecture, and Keil's tools that support it, then you need to read the following:
The Keil Manuals: http://www.keil.com/support/man_c51.htm
The so-called "bible" for the 8051 architecture:
Chapter 1 - 80C51 Family Architecture: www.nxp.com/.../80C51_FAM_ARCH_1.pdf
Chapter 2 - 80C51 Family Programmer's Guide and Instruction Set: www.nxp.com/.../80C51_FAM_PROG_GUIDE_1.pdf
Chapter 3 - 80C51 Family Hardware Description: www.nxp.com/.../80C51_FAM_HARDWARE_1.pdf
And, of course, the Datasheet for the particular chip you are (considering) using.