單片機(jī)低頻信號(hào)發(fā)生器課程設(shè)計(jì)(文件)
【正文】 TXING:MOV A,00H ；設(shè)置初值 LOOP4:MOVX DPTR,A ；把數(shù)據(jù)送到端口轉(zhuǎn)換 ADD A,R6 ；增加步長(zhǎng)改變數(shù)據(jù)上升波形 CJNE A,00H,LOOP4 ；A值是否到最高點(diǎn) 。ZXUAN: MOV A,00H ；設(shè)置初值LOOP7: MOV R7,A ；保存當(dāng)前的數(shù)據(jù) MOV DPTR,SIN ；讀取表的地址 MOVC A,A+DPTR ；讀取表中的數(shù)據(jù) MOV DPTR,8000H ；D/A0832的端口地址 MOVX DPTR,A ；進(jìn)行數(shù)據(jù)轉(zhuǎn)換 MOV A,R7 ；恢復(fù)當(dāng)前數(shù)據(jù) INC A ；為讀取表的下一個(gè)值做準(zhǔn)備 CJNE A,00H,LOOP7 是否讀完表的數(shù)據(jù) SJMP START ；返回檢測(cè)開(kāi)關(guān)TIAO: MOV R6,04H ；改變調(diào)頻/調(diào)幅 MOV R5,02H SJMP START ；返回檢測(cè)開(kāi)關(guān)；以下是通過(guò)正弦的值所建立的一個(gè)表SIN: DB 80H,83H,86H,89H,8DH,90H,93H,96H DB 99H,9CH,9FH,0A2H,0A5H,0A8H,0ABH,0AEH DBB1H,0B4H,0B7H,0BAH,0BCH,0BFH,0C2H,0C5H DB0C7H,0CAH,0CCH,0CFH,0D1H, 0D4H,0D6H,0D8H DB 0DAH,0DDH,0DFH,0E1H,0E3H, 0E5H,0E7H,0E9H DB 0EAH,0ECH,0EEH,0EFH,0F1H, 0F2H,0F4H,0F5H DB 0F6H,0F7H,0F8H,0F9H,0FAH, 0FBH,0FCH,0FDH DB 0FDH,0FEH,0FFH,0FFH,0FFH, 0FFH,0FFH,0FFH DB 0FFH,0FFH,0FFH,0FFH,0FFH, 0FFH,0FEH,0FDH DB 0FDH,0FCH,0FBH,0FAH,0F9H, 0F8H,0F7H,0F6H DB 0F5H,0F4H,0F2H,0F1H,0EFH, 0EEH,0ECH,0EAH DB 0E9H,0E7H,0E5H,0E3H,0E1H, 0DEH,0DDH,0DAH DB 0D8H,0D6H,0D4H,0D1H,0CFH, 0CCH,0CAH,0C7H DB 0C5H,0C2H,0BFH,0BCH,0BAH, 0B7H,0B4H,0B1H DB 0AEH,0ABH,0A8H,0A5H,0A2H, 9FH, 9CH, 99H DB 96H, 93H, 90H, 8DH, 89H, 86H, 83H, 80H DB 80H, 7CH, 79H, 78H, 72H, 6FH, 6CH, 69H DB 66H, 63H, 60H, 5DH, 5AH, 57H, 55H, 51H DB 4EH, 4CH, 48H, 45H, 43H, 40H, 3DH, 3AH DB 38H, 35H, 33H, 30H, 2EH, 2BH, 29H, 27H DB 25H, 22H, 20H, 1EH, 1CH, 1AH, 18H, 16H DB 15H, 13H, 11H, 10H, 0EH, 0DH, 0BH, 0AH DB 09H, 08H, 07H, 06H, 05H, 04H, 03H, 02H DB 02H, 01H, 00H, 00H, 00H, 00H, 00H, 00H DB 00H, 00H, 00H, 00H, 00H, 00H, 01H, 02H DB 02H, 03H, 04H, 05H, 06H, 07H, 08H, 09H DB 0AH, 0BH, 0DH, 0EH, 10H, 11H, 13H, 15H DB 16H, 18H, 1AH, 1CH, 1EH, 20H, 22H, 25H DB 27H, 29H, 2BH, 2EH, 30H, 33H, 35H, 38H DB 3AH, 3DH, 40H, 43H, 45H, 48H, 4CH, 4EH DB 51H, 55H, 57H, 5AH, 5DH, 60H, 63H, 66H DB 69H, 6CH, 6FH, 72H, 76H, 79H, 7CH, 80H END23。SUBB A,R6 DEC A CJNE A,00H,LOOP1 ；是否到最低點(diǎn)
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