疑问

只看该作者 · 2007-10-23 18:14

在KEIL 中
项目器件选中AT89S52
但是编译出现以下错误：
ORG    00H
LJMP    START
ORG    03H
    RETI
ORG    0BH
    RETI
ORG    13H
    RETI
ORG    1BH
    RETI
ORG    23H
       LJMP UART
ORG    2BH
    RETI
ORG    50H
START:
    MOV T2CON,#30H
    MOV RCAP2H,#0FFH
    MOV RCAP2L,#0DCH
    SETB EA
    CLR  ET2
    SETB TR2
    MOV  SCON,#0E0H
    SETB ES
    SETB REN

UART:    JBC TI,CON
WAIT:    JBC RI,READ
    AJMP WAIT
    MOV R0,#O0H
READ:    MOV A,SBUF
     CJNE A,#00H,OUT
    SETB TB8
    MOV A,#00H
    MOV SBUF,A
    INC R0
CON:    CJNE R0,#02H,OUT
     CLR TB8
    MOV A,#0FFH
    MOV SUBF,A
    INC RO
OUT:    RETI
END
Build target 'Target 1'
assembling xiuhua.asm...
xiuhua.asm(17): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(18): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(19): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(21): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(22): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(30): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(40): error A45: UNDEFINED SYMBOL (PASS-2)
xiuhua.asm(41): error A45: UNDEFINED SYMBOL (PASS-2)
Target not created
为什么？
就是
52扩展的SFR未定义
是定义后就好了
可是我以为项目器件选了，就不用定义了
软件内部会自动识别