【文章內(nèi)容簡介】 MAIN:MOV SP,50H MOV 20H,00H 。秒鐘　BIN MOV 21H,00H 。分鐘　BIN MOV 22H,00H 。小時　BIN MOV 23H,01H MOV 24H,01H MOV 25H,00H MOV 30H,00H MOV 31H,00H MOV 32H,00H MOV 33H,00H MOV 34H,00H MOV 35H,00H MOV 36H,01H MOV 37H,00H MOV 38H,01H MOV 39H,00H MOV TMOD,01H 。16位計數(shù)器 MOV TH0,03CH 。賦計數(shù)初值 MOV TL0,0B0H MOV IE,10000111B SETB TR0 。T0啟動計數(shù) MOV R2,14H MOV P2,0FFH LOOP: LCALL TIMEPRO LCALL DISPLAY1 JB ,M1 LCALL SETTIME 。調(diào)用設定時間程序 LJMP LOOP M1:JB ,M2 LCALL SETATIME 。調(diào)用設定時間程序 LJMP LOOP M2:JB ,M4 LCALL LOOKATIME 。調(diào)用設定鬧鐘時間程序 M4:LJMP LOOP DELAY:MOV R4,030H 。延時時間 DL00:MOV R5,0FFH DL11:MOV R6,9H DL12:DJNZ R6,DL12 DJNZ R5,DL11 DJNZ R4,DL00 RET 。設定時間程序: SETTIME: L0:LCALL DISPLAY1 。調(diào)用時間允許程序 MM1: JB ,L1 MOV C, JC MM1 LCALL DELAY1 。調(diào)用延時 JC MM1 MSTOP1: MOV C, JNC MSTOP1 。？釋放則繼續(xù) LCALL DELAY1 。調(diào)用延時 MOV C, JNC MSTOP1 INC 22H 。小時增加1 MOV A,22H CJNE A,18H,GO12 。判斷小時是否到24時？未到繼續(xù)循環(huán) MOV 22H,00H 。小時復位 MOV 34H,00H MOV 35H,00H LJMP L0 L1:JB ,L2 MOV C, JC L1 LCALL DELAY1 。延時 JC L1 MSTOP2: MOV C, JNC MSTOP2 。？釋放則繼續(xù) LCALL DELAY1 。調(diào)用延時 MOV C, JNC MSTOP2 INC 21H 。分鐘增加一 MOV A,21H CJNE A,3CH,GO11 MOV 21H,00H 。分鐘復位 MOV 32H,00H MOV 33H,00H LJMP L0 GO11:MOV B,0AH 。將A中的內(nèi)容分成高低兩部分 DIV AB MOV 32H,B MOV 33H,A LJMP L0 GO12: MOV B,0AH DIV AB MOV 34H,B MOV 35H,A LJMP L0 L2:JB ,L0 MOV C, JC L2 LCALL DELAY1 。調(diào)用延時 MOV C, JC L2 STOP1: MOV C, 。？