Keil forum the example in the folder Keil\C51\EXAMPLES\FarMemory\16MB RAM on ADuC812.

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the example in the folder Keil\C51\EXAMPLES\FarMemory\16MB RAM on ADuC812.

Weig gao over 21 years ago

in the example in the folder Keil\C51\EXAMPLES\FarMemory\16MB RAM on ADuC812.

FVAR (char, 0x015678) = 0x5A;
i = FVAR (char, 0x015678);

if i change 0x015678,such as:

FVAR (char, 0x016000) = 0x5A;
i = FVAR (char, 0x016000);

then there is a error:
***error 65:access violation at X:0x016000:no write 'permission'

why?

0 Drew Davis over 21 years ago

The simulator allows (and requires) you to configure memory space and access permissions. See the Debug / Memory Map option in uVision.
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0 Weig gao over 21 years ago in reply to Drew Davis

if i want to write:
<pre FVAR (char, 0x016000) = 0x5A
what can i do ?
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0 HansBernhard Broeker over 21 years ago in reply to Weig gao

Well, did you, or didn't you set up a memory mapping that covers address 0x16000 in XRAM?
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0 Keil Software Support Intl. over 21 years ago in reply to HansBernhard Broeker

A search in the Knowledgebase helps in such situations:
http://www.keil.com/support/docs/814.htm
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