下面这个是网上找到的使用DAC0832输出正弦波的汇编程序,请问高手假如需要输出100Hz的,那个正弦波的表格是怎么算出来的,请多多指教,谢谢!
ORG 000H
MAIN: MOV R1,#00H ;取表格初值
LOOP1:;在表格里取数送到指定地址/////////////////////
MOV A,R1
MOV DPTR,#SETTAB
MOVC A,@A+DPTR
MOV DPTR,#07FFFH
MOVX @DPTR,A
;/////////////////////////////////////////////
INC R1 ;表格加一
AJMP LOOP1 ;循环
SETTAB:
;正弦表格/////////////////////////////////////
DB 80H,83H,86H,89H,8DH,90H,93H,96H
DB 99H,9CH,9FH,0A2H,0A5H,0A8H,0ABH,0AEH
DB 0B1H,0B4H,0B7H,0BAH,0BCH,0BFH,0C2H,0C5H
DB 0C7H,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
END
