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sir ,
i want to add to data from the external memory. so i need correct format for this controller
XBYTE[0x1234] = 0x55; XBYTE[0x1245] = 0x11;
how to add this data and save it to another memory
Why are you using XBYTE? Why don't you define variables instead? eg,
unsigned char xdata addend; unsigned char xdata augend; unsigned int xdata sum; addend = 0x55; augend = 0x11; sum = addend + augend;
See: http://www.keil.com/support/man/docs/c51/c51_le_xdata.htm
If the absolute location in XDATA matters, use the _at_ keyword: http://www.keil.com/support/man/docs/c51/c51_le_absvarloc.htm
sorry sir. i had concentrate in some other work. so i had using new thread list.then coming to my point. i want a data for ex 0x55 is data. i want to get the data from particular memory location. so i have using XBYTE. But ur ans coding is the data is transfer through acc. it is corect. but i want
addend is store in the particular memory address &
augend is store in the another memory address and
result sum is stored in some other memory location
#include<stdio.h> #include<reg51.h> #include<intrins.h> unsigned char xdata addend; unsigned char xdata augend; unsigned int xdata sum; void main() { addend = 0x55; augend = 0x11; sum = addend + augend; }
Why not describing the problem you are trying to solve, instead of telling us details such that you want the data transfered through the accumulator?
If you give the picture, people can help solving the problem.
"addend is store in the particular memory address"
Is this really important to your application?
Of course, in practice, the data has to be physically stored in some specific location - but this is almost always entirely irrelevant to the program! Common exceptions would be shared memory, and memory-mapped IO - is this what you're doing? If not, why does the address matter to you?
If the address really does matter to you, I have already told you the keyword to use, and given you the relevan reference in the Manual - but you are going to have to read it for yourself!
Pointers
#include<stdio.h> #include<reg51.h> #include<intrins.h> unsigned char xdata *addend; unsigned char xdata *augend; unsigned int xdata sum; void main() { addend = 0x1234; augend = 0x1235; sum = *addend + *augend; }
_at_
#include<stdio.h> #include<reg51.h> #include<intrins.h> unsigned char xdata addend _at_ 0x1234; unsigned char xdata augend _at_ 0x1235; unsigned int xdata sum; void main() { sum = addend + augend; }
XBYTE
#include<stdio.h> #include<reg51.h> #include<intrins.h> unsigned int xdata sum; void main() { sum = XBYTE[0x1234] + XBYTE[0x1235]; }
The Manual is your Friend
thank you sir
sir
i want some details about Serial COM port. how the data get it from the Serial port. So what is the procedure for that type of program
Have you looked for manuals and sample programs for the processor of choice?
There are huge amounts of information available!