C51: variables in XDATA - why doesn't that work?

Hi everybody, I would like to access a variable in XDATA from different .c source files. Obviously, that doesn't work the way i'm doing it, but what am I doing wrong? Here is a tiny code...
C51: variables in XDATA - why doesn't that work?

Hi everybody, I would like to access a variable in XDATA from different .c source files. Obviously, that doesn't work the way i'm doing it, but what am I doing wrong? Here is a tiny code...
Why I can access the xdata memory 0x38000 to 0x3FFFF but can't access 0x28000 to 0x2FFFF?

I extend the off-chip xdata memory up to 128k, and code memory 128k. But when I access xdata 0x28000 to 0x2FFFF, the MCU(w77c32) is reseted. How can I do to resolve the problem?
Why I can access the xdata memory 0x38000 to 0x3FFFF but can't access 0x28000 to 0x2FFFF?

I extend the off-chip xdata memory up to 128k, and code memory 128k. But when I access xdata 0x28000 to 0x2FFFF, the MCU(w77c32) is reseted. How can I do to resolve the problem?
Can't change IOCON register in NXP LPC1114

Hello, I'm trying to configure I2C functinoality on PIO04 and PIO05 on a LPC1114. The same code works on CooCox but it won't work with Keil. I found that in Keil the register LPC_IOCON->PIO0_4 and...