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DATA to XDATA issue

Hi people,

I've some troubles with some variables declaration.
I'm using the old Keil compîler C51 V5.50.

When writing :

U8 u8CommandIndex=0;

with U8 = unsigned char, it's ok.

Now I want to relocate the variable into the XDATA segment. The declaration becomes :

xdata U8 u8CommandIndex=0;

But in this case, my variable isn't initialized to 0. The value is the last one before the reset.

Why the initialization isn't done in this case ?

Regards
Stephane

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0 Jon Ward over 22 years ago in reply to erik malund

Exactly as Eric suggests!

The XRAM on the 66x devices is NOT enabled by default. You must turn this memory on before you begin using it.

Refer to the following knowledgebase article:

http://www.keil.com/support/docs/1978.htm

Jon
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0 Jon Ward over 22 years ago in reply to erik malund

Exactly as Eric suggests!

The XRAM on the 66x devices is NOT enabled by default. You must turn this memory on before you begin using it.

Refer to the following knowledgebase article:

http://www.keil.com/support/docs/1978.htm

Jon
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0 Andy Neil over 22 years ago in reply to Jon Ward

"The XRAM on the 66x devices is NOT enabled by default. You must turn this memory on before you begin using it."

As I've said before:
the Compiler & Linker setup options (usually) simply inform the tools about your target; they do not generate any code which may be necessary to configure the hardware - you have to write that yourself!!

http://www.keil.com/forum/docs/thread2252.asp
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