PSW设置改进中断

• 浙江工业大学信息工程学院单片机实验

中断优先级实验，主程序相邻2个LED灯循环点亮（03H—C0H）1S，外部中断0后静态数码管间隔1S轮流点亮0-F后返回，外部中断1后1个LED灯循环点亮（01H-80H）后返回，外部中断0优先级高于外部中断1，实现中断嵌套

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P1接LED的ABCDEF，P3.2接K1，P3.3接K4，P0接静态数码管ABCDEF

    ORG     0000H
    AJMP    START

    ORG     0003H
    AJMP    INTT0
    
    ORG     0013H
    AJMP    INTT1
    
    ORG     0100H
START:
    MOV     SP,#60H
    MOV     PSW,#00H
    SETB    EX0
    SETB    IT0
    SETB    EX1
    SETB    IT1
    SETB    EA
    MOV     IP,#01H
    MOV     P3,#0FFH
MAIN:
    MOV     DPTR,#TABLE
    MOV     R0,#03H
    MOV     R2,#08H
    ACALL   LOOP
    LJMP    MAIN

LOOP:
    MOV     A,R0
    MOV     P1,A
    RL      A
    MOV     R0,A
    LCALL   D1S
    DJNZ    R2,LOOP
    RET

INTT0:
    PUSH    PSW
    PUSH    ACC
    MOV     PSW,#08H
    MOV     A,P3
    CPL     A
    JZ      RETURN
    LCALL   D10ms           //去抖动
    MOV     A,P3
    CPL     A
    JZ      RETURN
    JB      ACC.2,Pkey0
    LJMP    RETURN

INTT1:
    PUSH    PSW
    PUSH    ACC
    MOV     PSW,#10H
    MOV     A,P3
    CPL     A
    JZ      RETURN
    LCALL   D10ms           //去抖动
    MOV     A,P3
    CPL     A
    JZ      RETURN
    JB      ACC.3,Pkey2
    LJMP    RETURN
Pkey0:
    MOV     A,#00H
    MOVC    A,@A+DPTR
    CJNE    A,#0FFH,Pkey1
    LJMP    RETURN
Pkey1:
    MOV     P0,A
    LCALL   D1S
    INC     DPTR
    LJMP    Pkey0
Pkey2:
    MOV     R1,#01H
    MOV     R3,#08H
    ACALL   Pkey3
    LJMP    RETURN
Pkey3:
    MOV     A,R1
    MOV     P1,A
    RL      A
    MOV     R1,A
    LCALL   D1S
    DJNZ    R3,Pkey3
    RET
RETURN:
    POP     ACC
    POP     PSW
    RETI

TABLE:
    DB  0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H
    DB  80H,90H,88H,83H,0C6H,0A1H,86H,8EH
    DB  0FFH

D10ms:
    MOV     R7,#25
D4:
    MOV     R6,#200
    DJNZ    R6,$
    DJNZ    R7,D4
    RET

D1S:
    MOV     R5,#20
D5: MOV     R6,#100
D6: MOV     R7,#248
D7: DJNZ     R7,D7
    DJNZ    R6,D6
    DJNZ    R5,D5
    RET
    
    END