小直流电机调速实验.docx

小直流电机调速实验 一、实验目的 1、掌握直流电机的驱动原理2、了解直流电机调速的方法二、实验内容 １、用0832D/A转换电路的输出经放大后驱动直流电机。２、编制程序，改变0832输出经放大后的电压信号来控制电机转速。三、实验接线图 图6-8四、实验步骤 1、0832的片选信号CS5连到译码输出FF80H。2、连JX2→JX0。3、0832输出AOUT连DJ插孔。4、在“P.”状态下，按SCAL键，再输入1590后，按EXEC键。5、观察直流电机的转速。 五、实验程序清单 CODE SEGMENT ;DJ.ASM 0--5vASSUME CS:CODEDAPORT EQU 0FF80hPA EQU 0FF20H ;字位口PB EQU 0FF21H ;字形口PC EQU 0FF22H ;键入口 ORG 1590HSTART: JMP START0BUFDB ?,?,?,?,?,?data1: db0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h,80h,90h,88h,83h,0c6h,0a1h db 86h,8eh,0ffh,0ch,89h,0deh,0c7h,8ch,0f3h,0bfh,8FH,0F1HSTART0: call buf1DACON0: MOV AL,00HDACON1: MOV DX,DAPORT OUT DX,AL push ax call conv MOV CX,0010HDISCON: PUSH CX call disp POP CX LOOP DISCON pop ax INC AL CMP AL,00H JNZ DACON1 MOV AL,0FFHDACON2: MOV DX,DAPORT OUT DX,AL push ax call conv MOV CX,0010HDISCON2:PUSH CX call disp POP CX LOOP DISCON2 pop ax DEC AL CMP AL,0FFH JNZ DACON2 JMP DACON0CONV:MOV AH,AL AND AL,0FH MOV BX,OFFSET BUF MOV [BX+5],AL MOV AL,AH AND AL,0F0H MOV CL,04H SHR AL,CL MOV [BX+4],AL RETDISP: MOV AL,0FFH;00HMOV DX,PAOUT DX,ALMOV CL,0DFH;20H;显示子程序 ,5msMOV BX,OFFSET BUFDIS1: MOV AL,[BX] MOV AH,00HPUSH BXMOV BX,OFFSET DATA1 ADD BX,AX MOV AL,[BX]POP BXMOV DX,PBOUT DX,ALMOV AL,CLMOV DX,PAOUT DX,ALPUSH CXDIS2:MOV CX,00A0HDELAY: LOOP DELAY POP CXCMP CL,0FEH ;01HJZ LX1INC BXROR CL,1;SHR CL,1JMP DIS1LX1:MOV AL,0FFHMOV DX,PBOUT DX,ALRETBUF1:MOV BUF,0DH MOV BUF+1,19H MOV BUF+2,17H MOV BUF+3,17H MOV BUF+4,00H MOV BUF+5,00H RETDELY:PUSH CXDEL2:PUSH CXDEL3:PUSH CX LOOP $ POP CX LOOP DEL3 POP CX LOOP DEL2 POP CX LOOP DELY RETCODE ENDSEND START