单片机 散转程序设计 软件实验.doc

实验九 散转程序设计一、 实验目的1进一步熟悉MCS-51指令系统和汇编语言程序设计。 2学会用三种不同的方法设计散转程序，并掌握它们的区别。 二、 实验内容方法一ORG 0000H MOV 20H，#00H (20H)=00H 3字节TB0: MOV DPTR，#TABL (DPTR)=(TABL)=13H 3字节 (DPTR)=(TABL)=13H 3字节 (DPTR)=(TABL)=13H 3字节 (DPTR)=(TABL)=13H 3字节 (DPTR)=(TABL)=13H 3字节 MOV A,20H (A)=(20H)=00H 2字节 (A)=(20H)=01H 2字节 (A)=(20H)=02H 2字节 (A)=(20H)=03H 2字节 (A)=(20H)=04H 2字节 ADD A,20H (A)=(A)+(20H)=00H 2字节 (A)=(A)+(20H)=01H+01H=02H 2字节 (A)=(A)+(20H)=02H+02H=04H 2字节 (A)=(A)+(20H)=03H+03H=06H 2字节 (A)=(A)+(20H)=04H+04H=08H 2字节 ADD A,20H (A)=(A)+(20H)=00H 2字节 (A)=(A)+(20H)=02H+01H=03H (PSW)=OOH 2字节 (A)=(A)+(20H)=04H+02H=06H (PSW)=00H 2字节 (A)=(A)+(20H)=06H+03H=09H 2字节 (A)=(A)+(20H)=08H+04H=0CH (PSW)=00H 2字节 ADD A,DPL (A)=(A)+(DPL)=13H (PSW)=01H (P)=01H 2字节 (A)=(A)+(DPL)=03H+13H=16H (PSW)=01H (P)=01H 2字节 (A)=(A)+(DPL)=06H+13H=19H (PSW)=01H (P)=01H 2字节 (A)=(A)+(DPL)=09H+13H=1CH (PSW)=01H (P)=01H 2字节 (A)=(A)+(DPL)=0CH+13H=1FH (PSW)=01H (P)=01H 2字节 MOV DPL,A (DPTR)=(A)=13H 2字节 (DPTR)=(A)=16H 2字节 (DPTR)=(A)=19H 2字节 (DPTR)=(A)=1CH 2字节 (DPTR)=(A)=1FH 2字节 MOV A， #00H (A)=00H (PSW)=00H 2字节 (A)=00H (PSW)=00H 2字节 (A)=00H (PSW)=00H 2字节 (A)=00H (PSW)=00H 2字节 (A)=00H (PSW)=00H 2字节 JMP A+DPTR (PC)=(A)+(DPTR)=11H 1字节 (PC)=(A)+(DPTR)=14H 1字节 (PC)=(A)+(DPTR)=17H 1字节 (PC)=(A)+(DPTR)=1AH 1字节 (PC)=(A)+(DPTR)=1AH 1字节TABL: LJMP PR0 转到PR0 3字节 3字节 3字节 3字节 LJMP PR1 转到PR1 3字节 3字节 3字节 LJMP PR2 转到PR2 3字节 3字节 LJMP PR3 转到PR3 3字节 LJMP PR4 转到PR3 LJMP PR5 LJMP PR6 LJMP PR7PR0： INC R0 (R0)=(R0)+01H=01H 1字节 LJMP PR 转到PRPR1: INC R1 (R1)=(R1)+01H=01H 1字节 LJMP PR 转到PRPR2: INC R2 (R2)=(R2)+01H=01H 1字节 LJMP PR 转到PRPR3: INC R3 (R3)=(R3)+01H=01H 1字节 LJMP PR 转到PRPR4: INC R4 (R4)=(R4)+01H=01H 1字节 LJMP PR 转到PRPR5: INC R5 LJMP PRPR6: INC R6 LJMP PRPR7: INC R7PR： MOV A, 20H (A)=(20H)=00H 2字节 (A)=(20H)=01H (PSW)=01H (P)=01H 2字节 (A)=(20H)=02H (PSW)=01H (P)=01H 2字节 (A)=(20H)=03H 2字节 (A)=(20H)=04H (PSW)=01H (P)=01H 2字节 INC A (A)=(A)+01H=01H (PSW)=01H (P)=01H 1字节 (A)=(A)+01H=01H+01H=02H 1字节 (A)=(A)+01H=01H+02H=03H (PSW)=00H 1字节 (A)=(A)+01H=01H+03H=04H (PSW)=01H (P)=01H 1字节 (A)=(A)+01H=01H+04H=05H (PSW)=00H 1字节 ANL A，# 07H (A)=01H 2字节 (A)=02H 2字节 (A)=03H 2字节 (A)=04H 2字节 (A)=05H 2字节 MOV 20H，A (20H)=(A)=01H 2字节 (20H)=(A)=02H 2字节 (20H)=(A)=03H 2字节 (20H)=(A)=04H 2字节 (20H)=(A)=04H 2字节 LJMP TB0 转到TB0 转到TB0 转到TB0 转到TB0 转到TB0 SJMP $ END得到的结果如上往返不断地循环，以R0R7为一周期方法二ORG 0000HMOV 20H，#00H (20H)=00H 3字节TB0: MOV DPTR，#TABL (DPTR)=(TABL)=1EH 3字节 CLR A (A)=00H 1字节 MOV A,20H (A)=(20H)=00H 2字节 ADD A,20H (A)=(A)+(20H)=00H 2字节 JNC NADD 转到NADD INC DPHNADD:MOV B,A (B)=(A)=00H 2字节 MOVC A,A+DPTR (A)=(A)+(DPTR)=00H 1字节 XCH A,B (A)=00H (B)=00H 2字节 INC A (A)=(A)+01H=01H (PSW)=01H (P)=01H 1字节 MOVC A,A+DPTR (A)=(A)+(DPTR)=2EH (PSW)=00H 1字节 MOV DPL,A (DPTR)=2EH 2字节 MOV DPH,B (DPH)=00H 2字节MOV A， #00H (A)=00H 2字节JMP A+DPTR (PC)=(A)+(DPTR)=2EH 1字节 转到PR0TABL: DW PR0 DW PR1 DW PR2 DW PR3 DW PR4 DW PR5 DW PR6 DW PR7PR0： INC R0 (R0)=(R0)+01H=01H 1字节LJMP PR 转到PRPR1: INC R1LJMP PRPR2: INC R2LJMP PRPR3: INC R3LJMP PRPR4: INC R4LJMP PRPR5: INC R5LJMP PRPR6: INC R6LJMP PRPR7: INC R7PR： MOV A, 20H (A)=(20H)=00H 2字节INC A (A)=(A)+01H=01H (PSW)=01H (P)=01H 1字节ANL A，# 07H (A)=01H 2字节MOV 20H，A (20H)=(A)=01H 2字节LJMP TB0 转到TB0SJMP $END得到的结果如上往返不断地循环，以R0R7为一周期方法二ORG 0000HMOV 20H，#00H (20H)=00H 3字节TB0: MOV A,20H (A)=(20H)=00H 2字节 MOV DPTR，#TABL (DPTR)=(TABL)=0AH 3字节 MOVC A,A+DPTR (A)=(A)+(DPTR)=08H (PSW)=01H (P)=01H 1字节JMP A+DPTR (PC)=(A)+(DPTR)=12H 1字节 转到PR0TABL:DB PR0-TABL DB PR1-TABL DB PR2-TABL DB PR3-TABL DB PR4-TABL DB PR5-TABL DB PR6-TABL DB PR7-TABLPR0：INC R0 (R0)=(R0)+01H=01H 1字节LJMP PR 转到PRPR1: INC R1LJMP PRPR2: INC R2LJMP PRPR3: INC R3LJMP PRPR4: INC R4LJMP PRPR5: INC R5LJMP PRPR6: INC R6LJMP PRPR7: INC R7P