基于51單片機的數(shù)字頻率計的研究(已改無錯字)
2022-07-26 00:16:06 本頁面
【正文】 有效數(shù)位判別測量數(shù)據(jù)顯示開 始浮點數(shù)到BCD碼中斷服務程序周期測量f=1/T浮點數(shù)格式化圖31 數(shù)字頻率計程序流程圖（二）匯編語言源程序RS BIT ； RW BIT ； E BIT ； ORG 0000H LJMP MAIN ORG 002BH LJMP IT1MAIN:MOV P0,01H 。清除屏幕 ACALL ENABLE MOV P0,01H 。清除屏幕 ACALL ENABLE MOV P0,01H 。清除屏幕 ACALL ENABLE MOV P0,38H 。8位點陣方式 ACALL ENABLE MOV P0,0cH 。開顯示 ACALL ENABLE MOV P0,06H 。移動光標 ACALL ENABLE MOV P0,80H 。顯示位置 ACALL ENABLE MOV P0,80h 。第一行的位置 CALL ENABLE MOV DPTR,DATE CALL WRITE3 MOV P0,0C0H 。第二行的位置 CALL ENABLE MOV SP,7FH CLR CY MOV R6,00 MOV R2 00 MOV R3,00 MOV TMOD,15H MOV TL0,00H MOV TH0,00H MOV THI，high(6553650000) MOV TL1，low(6553650000) CHAL: SETB TR1 SETB TR0 MOV 27h,00H CLR C MOV C , MOV ,C CLR C MOV C, MOV ,C MOV A,27H ANL A,03H MOV 17H,ACHA: JBC TF1,JINWEI 。溢出進位 JMP CHAJINWEI:CLR TR1 MOV TH1,high(6553650000) MOV TL1,low(6553650000) SETB TR1 INC R3 MOV A,R3 CJNE A,20,CHA CLR TR0 CLR TR1 MOV R3,00 MOV R2,TH0 MOV R6,TL0 LCALL ZHUAN LCALL WRITE MOV TL0,00H MOV TH0,00H JIP CHALZHUAN:MOV A,R2CLR CMOV 20H,00HMOV 21H,00HMOV 22H,00HMOV 24H, 00HMOV 25H,00HMOV R3,10HNEXT: RLC AMOV R2,AMOV A,20HADDC A,20HDA AMOV 20H,AMOV A,21HADDC A,21HDA AMOV 21H,AMOV A,22HADDC A,22HDA AMOV 22H,AMOV A,R2DJNZ R3,NEXTMOV A,R6CLR CMOV R3,08HNEXT1: RLC AMOV R6,AMOV A,24HADDC A,24HDA AMOV 24H,AMOV A,25HADDC A,25HDA AMOV 25H,AMOV A,R6DJNZ R3,NEXT1CLR CMOV A,24HADDC A,20HDA AMOV 20H,AMOV A,25HADDC A,21HDA AMOV 21H,AMOV A,22HADDC A,00HDA AMOV 22H,AMOV A,22HANL A,0FHMOV 31H,AMOV A,22HMOV A,0F0HSWAP AMOV 30H,AMOV A,21HANL A,0F0HSWAP AMOV 32H,AMOV A,21HANL A,0FHMOV 33H,AMOV A,20HANL A,0F0HSWAP AMOV 34H,AMOV A,20HANL A,0FHMOV 35H,ARET。**************。LCD顯示。************** ENABLE:CLR RS CLR RW CLR E ACALL DELAY SETB E RET WRITE: MOV 10H,00H。寫數(shù)據(jù) MOV 11H,00H MOV 12H,00H MOV 13H,00H MOV 14H,00H MOV 15H,00H MOV 16H,00H MOV P0,0CH CALL ENABLE MOV P0,0C0H 。第二行的位置 CALL ENABLE MOV A,17H XRL A,02H JNZ XIAN1 MOV 40H,00H MOV 41H,00H MOV 42H,00H MOV 43H,30H MOV 44H,31H MOV 45H,32H JMP XIAN XIAN1:MOV A,17H XRL A,01H JNZ XIAN2 MOV 40H,00H MOV 41H,00H MOV 42H,30H MOV 43H,31H MOV 44H,32H
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