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高手看看显示程序哪里出错啊;---------------------------------------
; 四位共阳LED动态扫描显示程序
; P0为段码口,P2为位选口(低电平有效)
; 参数为要显示的字符串指针
;---------------------------------------
NAME DISPLAY
?PR?_DISPLAY?DISPLAY SEGMENT CODE
?CO?_DISPLAY?DISPLAY SEGMENT DATA
EXTRN CODE (_DELAY)
PUBLIC _DISPLAY
RSEG ?CO?_DISPLAY?DISPLAY
?_DISPLAY?BYTE:
DISPBIT: DS 1
DISPNUM: DS 1
RSEG ?PR?_DISPLAY?DISPLAY
_DISPLAY: PUSH ACC
PUSH DPH
PUSH DPL
PUSH PSW
INC DISPNUM
MOV A, DISPNUM
CJNE A, #4, DISP1
DISP1: JC DISP2
MOV DISPNUM, #00H
MOV DISPBIT, #0FEH
DISP2: MOV A, R1
ADD A, DISPNUM
MOV R0, A
MOV A, @R0
MOV DPTR, #DISPTABLE
MOVC A, @A+DPTR
MOV P0, A
MOV A, DISPNUM
CJNE A, #2, DISP3
CLR P0.7
DISP3: MOV P2, DISPBIT
MOV R6, #00H
MOV R7, #0AH
LCALL _DELAY
MOV P0, #0FFH
MOV P2, #0FFH
MOV A, DISPBIT
RL A
MOV DISPBIT, A
POP PSW
POP DPL
POP DPH
POP ACC
RET
DISPTABL: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,88H,83H,0C6H,0A1H,86H,8EH,0BFH,0FFH
; "0", "1", "2", "3","4", "5","6","7", "8","9","A","B","C", "D", "E","F", "-", " "
END
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