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帮忙简单看看!下面这段代码能实现中断嵌套吗?
我想在执行INT1时可以进串口中断
IP=0F0H
可是两种中断无法共存,这是为什么?ORG 0000H
LJMP INITIAL
ORG 0013H
LJMP INTER1
ORG 0023H
LJMP UARTI
ORG 0030H
TAB1: DB 88H,98H,84H,94H,8CH,9CH,82H,92H, 0B0H,0A8H,0B8H,0A4H,0B4H,0ACH,0BCH,0A2H,0BCH
TAB2: DB 0C8H,0D8H,0C4H,0D4H,0CCH,0DCH,0C2H,0D2H, 0F0H,0E8H,0F8H,0E4H,0F4H,0ECH,0FCH,0E2H,0BDH
;FLAG EQU 00H
INITIAL:
MOV SP,#7FH
MOV PCON,#00H
MOV SCON,#50H
MOV TMOD,#20H
MOV TH1,#0FDH
MOV TL1,#0FDH
MOV IP,#0F0H
SETB TR1
SETB P2.0
;SETB P2.1
; NOP
;CLR P2.0
;MOV P0,#0BFH
;CLR FLAG
CLR P3.5
SETB EA
SETB EX1
SETB ES
MAIN:
CLR P2.0
MOV P0,#0BFH
MAIN1:
MOV R2,#20
DOG:
;JB FLAG,CLRWAR
;CPL P3.5
CPL P3.4
LCALL DELAY
DJNZ R2,DOG
CPL P3.5
LJMP MAIN1
;SJMP DOG
;CLRWAR:
;CLR P2.0
;MOV P0,#0BFH
;CPL P3.4
;CPL P3.5
;CLR FLAG
;SJMP DOG
INTER1:
CLR EA
CLR ES
CLR EX1
PUSH ACC
PUSH PSW
SETB EA
SETB ES
MOV A,#0FFH
MOV SBUF,A
SEND:
CPL P3.4
JBC TI,SEND1
SJMP SEND
SEND1:
CLR P2.0
CLEARWAR:
CPL P3.4
MOV P0,#0FFH
JJJ:
JNB P3.3,CLL
; SETB P2.0
;SETB FLAG
LJMP EXIT1
CLL:
LCALL DELAY
CPL P3.4
LCALL DELAY
CPL P3.4
LCALL DELAY
CPL P3.4
LCALL DELAY
CPL P3.4
LCALL DELAY
CPL P3.4
CPL P3.5
LJMP JJJ
EXIT1:
MOV P0,#0BFH;;;;;;;;;;;;;00000000000;;;;;;;;;;
CLR EA
CLR ES
;CLR EX1
POP PSW
POP ACC
;SETB P2.0
SETB EA
SETB EX1
SETB ES
RETI
UARTI:
CLR EA
CLR EX1
CLR ES
; MOV R6,#0FFH
MOV R7,#10
UART1:
CPL P3.4
JBC RI,RECEIVE
U1:
CPL P3.4
MOV R6,#0FFH
U2:
DJNZ R6,U2
DJNZ R7,U1
LJMP EXITU
RECEIVE:
MOV A,SBUF
CJNE A,#0AAH,RRNEXT
LCALL LOOPHERE
LJMP EXITU
RRNEXT:
CJNE A,#0BBH,EXITU
LCALL LOOPFAR
EXITU:
POP PSW
POP ACC
SETB EA
SETB EX1
SETB ES
RETI
DELAY:
MOV R3,#200
DL1:
MOV R4,#50
DL2:
CPL P3.4
DJNZ R4,DL2
DJNZ R3,DL1
CPL P3.4
;CPL P3.5
RET
LOOPHERE:
CWAIT:
CPL P3.4
JBC RI,CWAITT1
SJMP CWAIT
CWAITT1:
MOV A,SBUF
CJNE A,P1,RETURN1
CWAIT1:
CPL P3.4
JBC RI,CWAITT2
SJMP CWAIT1
CWAITT2:
MOV A,SBUF
MOV R1,A
SUBB A,#11H
JNC LCAST
MOV A,R1
;NOP;;;;;;;;;;;;;
;MOV A,#01H;;;;;;;;;;;;;;;;;;;;;;;;;;;;
MOV DPTR,#TAB1
MOVC A,@A+DPTR
CLR P2.0
MOV P0,A
; NOP
WLOOPF:
CPL P3.4
JBC RI,WLOOPF1
SJMP WLOOPF
WLOOPF1:
MOV A,SBUF
CJNE A,#0CCH,WLOOPF
MOV P0,#0BFH
CPL P3.4
RET
;SETB P2.0
RETURN1:
MOV A,#0CCH
MOV SBUF,A
RETURN2:
CPL P3.4
JBC TI,RETURN3
SJMP RETURN2
RETURN3:
RET
LCAST:
LCALL CAST
RET
LOOPFAR:
CWAIT2:
CPL P3.4
JBC RI,CWAITT4
SJMP CWAIT2
CWAITT4:
MOV A,SBUF
CJNE A,P1,RETURN4
CWAIT3:
CPL P3.4
JBC RI,CWAIT5
SJMP CWAIT3
CWAIT5:
MOV A,SBUF
MOV R1,A
SUBB A,#11H
JNC LCAST1
MOV A,R1
MOV DPTR,#TAB2
MOVC A,@A+DPTR
CLR P2.0
MOV P0,A
WLOOPF2:
CPL P3.4
JBC RI,WLOOPF3
SJMP WLOOPF2
WLOOPF3:
MOV A,SBUF
CJNE A,#0CCH,WLOOPF2
MOV P0,#0BFH
;SETB P2.0
CPL P3.4
RET
RETURN4:
MOV A,#0CCH
MOV SBUF,A
RETURN5:
CPL P3.4
JBC TI,RETURN6
SJMP RETURN5
RETURN6:
RET
LCAST1:
LCALL CAST
RET
CAST:
CPL P3.4
MOV A,#0EEH
MOV SBUF,A
CAST1:
CPL P3.4
JBC TI,CAST2
SJMP CAST1
CAST2:
RET
END
第2楼:
不看你的程序了，一般只要定义中断优先级就可以在低优先级中断过程中可以优先响应高优先级的中断。将你的串口中断
定义为高优先级的中断
第3楼: 將串口中斷優先級設置成高于外部中斷1將串口中斷優先級設置成高于外部中斷1
第4楼: 热：朋友：别瞎忙活了；听过中断里面套中断吗！？？合理吗！单片几不是语言编译器。不是符合逻辑的都行！！！
第5楼: 说什么呢哥们当然可以嵌套了
我都套过n次了
51里面允許兩級中斷，你用51?
51里面允許兩級中斷，
你用51?
问题已经解决了,谢谢各位的建议!我也不知道问题产生的原因.但是已经解决了,谢谢各位!