1 DAT_74164 BIT P0.6 2 CLK_74164 BIT P0.7 3 4 org 0000H 5 jmp MAIN 6 7 ;******************************************* 8 org 0030H ;Start program from 0030H 9 MAIN: 10 mov P0,#0FFH ;四个mov:端口初始化关闭外围 11 mov P1,#0FFH 12 mov P2,#0FFH 13 mov P3,#0FFH 14 15 mov 30H,#00H ;Intialize the variable ,变量30H赋值00H(30H:128个数据存储器中地址为30的) 16 DISP_LOOP: 17 mov a,30H ;Get the value to display 18 mov dptr,#TAB_LED ;(TAB_LED中的内容加载到数据指针)给寄存器或者变量dptr赋一个数组,数组名为TAB_LED 19 movc a,@a+dptr ;(代码字节传送到累加器)拿序号换内容,在数组中查内容赋给a 20 call sendTo74164 ;Display the numbet 21 mov P0,#11011111B ;发送位选,第几个数码管亮 22 call delay 23 24 mov a,30H 25 inc 30H ;给30H+1即30H=30H+1 26 cjne a,#09,DISP_LOOP ;如果a!=9则跳出循环 27 28 jmp $ 29 30 31 ret 32 ;******************************************* 33 ;Send data of A to chip 74LS164 34 sendTo74164: 35 push 07h 36 push acc 37 38 mov r7,#08 ;send 8 bits 39 SEND164_LOOP: 40 clr CLK_74164 ;clear clock-line for reading data 41 rlc a 42 mov DAT_74164,c ;move data-bit to data-line 43 setb CLK_74164 ;send data to 74164 44 djnz r7,SEND164_LOOP 45 46 pop acc 47 pop 07h 48 ret 49 ;******************************************* 50 ;Dealy for a interval 51 delay: 52 mov r5,#06H 53 DELAY_2: 54 mov r6,#0FFH 55 DELAY_1: 56 57 mov r7,#0FFH 58 DELAY_0: 59 nop 60 nop 61 djnz r7,DELAY_0 62 63 djnz r6,DELAY_1 64 65 djnz r5,DELAY_2 66 67 ret 68 ;**************************************************** 69 TAB_LED: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H 70 ;**************************************************** 71 END
solution:
1 delay 的机器周期?
标签:0FFH,DELAY,74164,movc,mov,30H,数码管,选码,data From: https://www.cnblogs.com/luoxiaoluo/p/16799998.html