51单片机延时程序（国外英文资料）.docVIP

51单片机延时程序（国外英文资料） Single chip delay program (suitable for beginners) The time delay of the following is the single chip microcomputer program (including the asm and C program, all is me learning used in the process of the single chip microcomputer), should be considered in the program of MCU delay the use of the frequency of the crystals, we often use in 51 series microcontroller is 11.0592 MHz and 12.0000 MHz crystals, and commonly used on the AVR microcontroller is 8.000 MHz and 4.000 MH crystals so if it involves precise time delay in the finder net is should pay attention to the frequency of the crystals. Software latency: (asm) Vibrate 12MHZ, delay 1 second Procedure is as follows: DELAY: MOV 72 h, # 100 LOOP3: MOV 71 h, # 100 LOOP1: MOV 70 h, # 47 LOOP0 LOOP0JNZ 70 h The NOP DJNZ 71 h, LOOP1 MOV 70 h, # 46 LOOP2 LOOP2JNZ 70 h The NOP LOOP3 DJNZ 72 h MOV 70 h, # 48 LOOP4 LOOP4JNZ 70 h Timer delay: 1, 1, 1, 1, 1, 1 DELAY1: MOV. Vibrate 12MHZ, a delay of 0.5 seconds AJMP DELAY DELAY2: MOV R7, # 14H; Vibrate 12MHZ, delay 1 second DELAY: CLR EX0 MOV TMOD # 01H; Set the timer to work in a way 1 MOV TL0. Set the timer to set the count initial value MOV TH0, # 3CH SETB TR0; Start the timer HERE: JBC TF0, NEXT1 SJMP HERE NEXT1: MOV TL0, # 0B0H MOV TH0, # 3CH DJNZ R7, HERE CLR TR0; The timer wants the software to be clear SETB EX0 RET C language delay program: Void delay_18B20 (unsigned int I) { While (I -); } Void Delay10us () / / 12mhz { _NOP_ (); _NOP_ (); _NOP_ (); _NOP_ (); _NOP_ (); _NOP_ (); } * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / Void delay (uint t) { (t, , 0; t --); } 1ms delay subroutine (12MHZ) Void delay1ms (uint p) / / 12mhz {uchar I, j; For (I = 0; I p; I + +) { For (j = 0; j 124; j + +) {; } } } Function: a delay of 20ms * * * * * * * * * * * * * * * * * * * * * * * * * *