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Hello everybody, I am testing a program for AT89S54(AT89C51RB2) with uVision2.As you konwn,this chip has 768 bytes expanded RAM(XRAM).I want to use the XRAM for my program,but the XRAM space cannot be accessed. The site of AT89C51RB2:") REGFILE=AT89C51RB2.H("Atmel") SFILE="STARTUP.A51" ("Standard 8051 Startup Code") SIM=S8051.DLL DP51.DLL("-pATRB2") ____________________________________________________
And in the option of my project,I have defined as below. Selected__________________________________ _______Memory Model:[Large:varialble in XDATA] Checked BOX______________________ _______Use On-chip XRAM(0x0-0x3FF)
What should I do for setting uVision2?
Thanks in advance.
Hi, Most people on this forum are very good with hexadecimal numbers. OK.I'll do it so.
OH you are using the large model, I just can't visualize anyone doing that. That may explain the above.
And in my program,
#include <AT89C51RB2.h> extern void DispByteData(unsigned char arii); unsigned char ipdata[142]; #define XNUM 100 unsigned char xdata xbuf[XNUM];
The memory is used apparaently as below. ______1d + 142d + 100d = 243d (bytes) About the rest of part ______256d-243d=13d (bytes) I will recompile my program in another mode,and report the result.
marc