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 ；四个端口初始化，关闭外围 11 mov P1,#0FFH 12 mov P2,#0FFH 13 mov P3,#0FFH 14 15 MAIN_LOOP: 16 mov P0,#11111110B ;The first to show 1，位选 17 mov a,#0F9H ；段选，给a设一个F9：1111 1001，共阳0有效 18 call sendTo74164 ；约等于60微秒 19 call MIN_DELAY ；约等于10000微秒 20 21 mov P0,#11111101B ;The second to show 2 22 mov a,#10100100B 23 call sendTo74164 24 call MIN_DELAY 25 26 mov P0,#11111011B ;The third to show 3 27 mov a,#10110000B 28 call sendTo74164 29 call MIN_DELAY 30 31 jmp MAIN_LOOP 32 33 ret 34 ;******************************************* 35 ;Send data of A to chip 74LS164 36 sendTo74164: 37 push 07h 38 push acc 39 40 mov r7,#08 ;send 8 bits 41 SEND164_LOOP: 42 clr CLK_74164 ;clear clock-line for reading data 43 rlc a 44 mov DAT_74164,c ;move data-bit to data-line 45 setb CLK_74164 ;send data to 74164 46 djnz r7,SEND164_LOOP 47 48 pop acc 49 pop 07h 50 ret 51 ;******************************************* 52 ;Dealy for a interval 53 DELAY: 54 mov r5,#20H 55 DELAY_2: 56 mov R6,#0FFH 57 DELAY_1: 58 59 mov R7,#0FFH 60 DELAY_0: 61 nop 62 nop 63 djnz R7,DELAY_0 64 65 djnz R6,DELAY_1 66 67 djnz R5,DELAY_2 68 69 ret 70 ;******************************************* 71 ;Dealy for a interval 72 MIN_DELAY: （内循环1ms） 73 mov R6,#8 74 DELAY_02: 75 mov R7,#250 76 DELAY_01: 77 nop 78 nop 79 djnz R7,DELAY_01 80 djnz R6,DELAY_02 81 ret 82 ;******************************************* 83 END
标签：0FFH,74164,djnz,从左到右,mov,DELAY,数码管,call,板上 From： https://www.cnblogs.com/luoxiaoluo/p/16800036.html