自制16键电子琴

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ORG 0000H

LJMP START

ORG 000BH

LJMP TIM0

START:

MOV TMOD,#00000001B

MOV IE,#10000010B

L1:

LCALL KEY;

CLR EA

CLR TR0

JB F0,L1

MOV A,22H

RL A

MOV DPTR,#TABLE

MOVC A,@A+DPTR;

MOV TH0,A

MOV 21H,A

MOV A,22H

RL A

INC A

MOVC A,@A+DPTR;

MOV TL0,A

MOV 20H,A

L2:

LCALL KEY;

CLR EA

CLR TR0

JB F0,L1;

LJMP L2;

KEY:

SETB F0

MOV R3,#0F7H;

MOV R1,#00H;

L3:

MOV A,R3;

MOV P1,A;

MOV A,P1;

CLR C;

CPL C;

MOV R5,#04H

L4:

RLC A;

JNC KEYIN;

INC R1;

DJNZ R5,L4;

MOV A,R3;

CLR C;

CPL C;

RRC A;

MOV R3,A;

JC L3;

RET;

KEYIN:

MOV 22H,R1;

CLR F0;

RET;

TIM0:

PUSH ACC;

PUSH PSW;

MOV TL0,20H;

MOV TH0,21H;

CPL P3.5

POP ACC;

RETI ;

TABLE:

DW 64021,64103,64230,64400

DW 64524,64580,64684,64777

DW 64820,64898,64968,65030

DW 65058,65110,64968,65030

END

ORG 0000H

LJMP START

ORG 000BH

LJMP TIM0

START:

MOV TMOD,#00000001B

MOV IE,#10000010B

L1:

LCALL KEY;

CLR EA

CLR TR0

JB F0,L1

MOV A,22H

RL A

MOV DPTR,#TABLE

MOVC A,@A+DPTR;

MOV TH0,A

MOV 21H,A

MOV A,22H

RL A

INC A

MOVC A,@A+DPTR;

MOV TL0,A

MOV 20H,A

L2:

LCALL KEY;

CLR EA

CLR TR0

JB F0,L2;

LJMP L2;

KEY:

SETB F0

MOV R3,#0F7H;

MOV R1,#00H;

L3:

MOV A,R3;

MOV P1,A;

MOV A,P1;

CLR C;

CPL C;

MOV R5,#04H

L4:

RLC A;

JNC KEYIN;

INC R1;

DJNZ R5,L4;

MOV A,R3;

CLR C;

CPL C;

RRC A;

MOV R3,A;

JC L3;

RET;

KEYIN:

MOV 22H,R1;

CLR F0;

RET;

TIM0:

PUSH ACC;

PUSH PSW;

MOV TL0,20H;

MOV TH0,21H;

CPL P3.5

POP ACC;

RETI ;

TABLE:

DW 64021,64103,64260,64400

DW 64524,64580,64684,64777

DW 64820,64898,64968,65030

DW 65058,65110,65157,65178

END