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A simple data type question


Hi all:
   Could anyone give me some detail about the following statement:

	#define IOPDATA		((volatile unsigned *)(SYSCFG + 0x5008))

if I change the *IOPDATA = 0x0; then how many bit can I change . what data
width is the (volatile unsigned *)? if I want to use a 32-bit width pointer
how can I do it?

Thanks all.


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