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问 在keil如果选择STC89c51，虽说有256B RAM，但如果RAM用量超过128B时，编译会出错，通不过。但是如果选择AT89S52却没有以上问题！！
希望版主可以做一个真正好用的STC89C51 Keil文件！ 答 1: 跟STC没关系还是你KEIL用的不熟 答 2: 为什么只说半截话呢?我也想知道原因. 答 3: idata定义变量的时候再加一个idata 另外的128b 就可以用了 ：）
如 char idata i; 答 4: 但是为什么用AT89S52却可以呢？人家也是128+128的啊 答 5: 这是选择ATC89C51RC时的编译出错信息*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
    SEGMENT: ?PR?FRECREAD?MAIN
*** ERROR L107: ADDRESS SPACE OVERFLOW
    SPACE:   IDATA   
    SEGMENT: ?ID?MAIN
    LENGTH:  002BH
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  ICYCLEPREV
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  ICYCLECURR
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  DISPBUFFER
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  IFREC
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  ICYCERRPREV
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  ICYCERRCURR
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  CCYCLES
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  IADCDATA
    SEGMENT: ?ID?MAIN
*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  DISPDATA
    SEGMENT: ?ID?MAIN
Program Size: data=141.2 xdata=6 code=4876
Target not created

这是选择ATC89C51RC时的编译出错信息 答 6: 这是选择AT89S52是的编译信息Build target 'Target 1'
assembling STARTUP.A51...
compiling ZLG7289.C...
compiling main.c...
compiling adc.c...
compiling SysTimer.c...
compiling PCA.c...
compiling eeprom.c...
compiling queue.c...
compiling memory.c...
linking...
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
    SEGMENT: ?PR?FRECREAD?MAIN
Program Size: data=141.2 xdata=6 code=4876
creating hex file from "ZLG7289"...
"ZLG7289" - 0 Error(s), 1 Warning(s). 答 7: keil中AT89S52的描述8051 based Full Static CMOS controller with Three-Level Program
Memory Lock, 32 I/O lines, 3 Timers/Counters, 8 Interrupts Sources,
Watchdog Timer, 2 DPTRs, 8K Flash Memory, 256 Bytes On-chip RAM 答 8: keil中STC89C51RC的描述Package:PLCC44,PDIP40,PQFP44
Operating TEMP:0 to +70;
Power Supply:4.5V~5.5V
Operating Frequency:0 to 80 MHz,
an 8051 compatible controller
32 I/O Lines, Dual DPTR,
ISP/IAP,X2 mode,
3 Timer/Counter,
8 Interrupts/4 priority levels,
Watchdog Timer,
512 bytes on-chip RAM,
4K Flash memory,
1K EEPROM. 答 9: squarelook：你看这是不是和keil文件有关啊 答 10: 在KEIL中哪里能找到STC89C51RC这个片子啊在KEIL中哪里能找到STC89C51RC这个片子啊？KEIL好象不直接支持STC的吧？