【正文】 MOV DPTR,7F00H MOV A,R3 MOVX DPTR,A ACALL DL1MS MOV A,R3 JNB ,AA3 RR A MOV R3,A INC R0 AJMP AA2AA3: POP 03H POP 00H POP ACC RETSTTK: ACALL DIS MOV DPTR,7F00H MOV A,00H MOVX DPTR,A MOV DPTR,7F02H MOVX A,DPTR ANL A,03H CJNE A,03H,STTK AJMP BEGINA1: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H DB 7FH,6FH,77H,7CH,39H,5EH,79H,71HDL1MS: MOV R7,02HDL0: MOV R6,0FFHDL1: DJNZ R6,DL1 DJNZ R7,DL0 RETBJZ: MOV 57H,01H 。前4拍 CPL A MOV 58H,A 。步距4拍 MOV A,57H CJNE A,01H,FZ MOV A,58H CJNE A,01H,ZX 。START=0,CLR=0跳去顯示FAN: MOV 57H,00H 。轉(zhuǎn)次數(shù) MOV 54H,00H 。（4） 按START鍵啟動步進(jìn)電機開始轉(zhuǎn)動，到位后停止；按CLR鍵清零步進(jìn)電機回原位。（2） 鍵入7（次數(shù)）45（角度值）鍵入SET設(shè)置完畢，鍵入START步進(jìn)電機轉(zhuǎn)動45度7次；停止后鍵入CLR返回零位；每個過程都必須有相關(guān)的顯示。正反轉(zhuǎn)標(biāo)志位 MOV 58H,01H 。正轉(zhuǎn)標(biāo)志 ACALL BJ1 MOV 40H,50H MOV 41H,51H MOV 42H,52H MOV 43H,53H MOV 50H,60H MOV 51H,61H MOV 52H,62H MOV 53H,63H MOV 57H,01H 。標(biāo)志位區(qū)反 AJMP AAA1ZX: MOV DPTR,L2 。轉(zhuǎn)R1次*15AAA2: MOV R0,04H 。START=0 CJNE A,01H,NT 。角度百位 MOV 53H,00H 。3. 實現(xiàn)：（1） 定義鍵盤按鍵：5個數(shù)字鍵；3個功能鍵：設(shè)置SET、清零CLR、開始START；（2） 顯示器上第一位顯示次數(shù)，后三位顯示每次行走的角度；（3） 通過鍵盤的按鍵，設(shè)置步進(jìn)電機各次的角度值；按動SET鍵后，開始設(shè)置：第一位設(shè)置次數(shù)，后三位設(shè)置角度值，再按動SET置入；可連續(xù)置入的角度。四、 程序代碼實驗一：按鍵設(shè)置為 0 1 7 8 E F A B程序： ORG 0000H LJMP MAIN ORG 0100HMAIN: MOV 50H,00H MOV 51H,00H MOV 52H,00H MOV 53H,00H MOV R5,53H。前后4拍標(biāo)志位 MOV 59H,00H 。正轉(zhuǎn)標(biāo)志 ACALL BJ1 MOV 54H,01H MOV 55H,01H RETBJF: MOV 57H,00H 。后4拍 CPL A MOV 58H,A AJMP AAA1FZ: MOV A,58H CJNE A,01H,FX 。要轉(zhuǎn)A次15 MOV 59H,A MOV R0,53H MOV 56H,53H MOV A,R0 CJNE A,00H,AAA4 MOV 54H,00H MOV 55H,00H AJMP BACKAAA4: MOV R5,53HAAA3: MOV R1,59H 。跳去顯示TEST1: MOV A