Renesas TM V.3.20A Especificaciones descargar pdf (Pagina 251)

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Renesas Technology, Tools FAQs

Last Updated: February 4, 2000

Document Number: 01051094_e

I am using the read/write method to allocate variables to addresses as a method of controlling the ports on the I/O area in C

language. However, only the last read/write is saved, all others are erased. Is there any way to work around this?

This is due to the affects of the compiler optimization. We suggest making the variable a volatile declaration. The volatile

declaration will guarantee the read/write to each variable and is also valid for the area specified by the pointer.

However, the optimization may modify the volatile area accessing size and the read/write order of multiple volatile variable that are

written in one sentence.Therefore, you should carefully trace the behavior of the codeoutput from the compiler.

If you need to include precise details of the read/write order or access size in one line, we suggest you describe it directly in

assembly language or use an asm function.

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Renesas TM V.3.20A Especificaciones Pagina 251

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