单片机课程设计参考程序.doc

设计思路：1、255计数：255可用8位二进制数表示，故本设计可直接采用可以重装载的计数器T1模式二进行计数。然后对TL1的内容进行相应的二进制-十进制转换：首先TL1的内容除以64H，所的商就是十进制的百位，然后用余数除以0AH，所得的商就是十进制数的十位，余数即相应的十进制的个位。接着将相应的十进制数进行译码，并在LED数码管上显示出来。每来一个脉冲其显示的结果加一，直加至255然后T1重新开始计数。开始初始化堆栈，定时器初始化清零相关RAM地址单元TF1=1?调用显示子程序脉冲数加1即20H加120H=100?21H加120清零计算出脉冲数的个,十,百位分别存放于30H,31H,32H(20H=54)&(21H=2?)脉冲数计到255后重新计数即20H，21H清零说明：1. 20H存放脉冲的个位和十位数值，21H存放脉冲的百位和千位数值。 2.计算脉冲数的个位和十位数值：(20H)/10的商即十位数值存放于31H,余数即个位数值存放于30H。 3. 计算脉冲数的百位数值：(20H)/10的余数即百位数值存放于32H。例如：脉冲数212（十进制），(20H)=12,(21H)=2。脉冲的个位数值(30H)=2, 脉冲的十位数值(31H)=1, 脉冲的百位数值(32H)=2. 图3 255计数程序流程图课程设计参考程序，希望大家好好研读，尽量完全融会贯通。一、255计数ORG 0000H LJMP STARTORG 0030HSTART: MOV TMOD,#50HSETB TR1SETB TR0MOV A,TL1LCALL BCDLCALL DISPLAY LJMP STARTBCD: MOV B,#64HDIV ABMOV 72H,AXCH A,BMOV B,#0AHDIV ABMOV 71H,AMOV 70H,BRETDISPLAY: MOV R1,#70h ;指向显示缓冲区的首地址 MOV R5,#00h ;数码管显示从最低位开始play: MOV A,R5MOV p2,AMOV A,R1MOV DPTR,#TABMOVC A,A+DPTRMOV p0,ALCALL dl5ms MOV p0,#0ffh ;消隐INC R1INC R5CJNE R5,#03h,playRET;1ms 延时程序,LED显示用dl5ms: push 06hpush 07hmov r6,#32hdl1: mov r7,#10hdl2: djnz r7,dl2djnz r6,dl1nopnopnoppop 07hpop 06hRETEND TAB: DB 0C0h,0F9h,0A4h,0B0h,099h,092h,082h,0F8h,080h,90h ;0 1 2 3 4 5 6 7 8 9 不亮二、0-999999循环计数 ORG 0000H LJMP START ORG 0030H START: MOV 70H,#00H MOV 71H,#00H MOV 72H,#00H MOV 73H,#00H MOV 74H,#00H MOV 75H,#00H MOV TL1,#0FFH START1: MOV TMOD,#50H SETB TR1 LCALL DISPLAY MOV R4,TL1 CJNE R4,#00H,START1 LCALL BCD LJMP START1 BCD: MOV TL1,#0FFH INC 70H MOV A,70H CJNE A,#0AH,RETURN MOV 70H,#00H INC 71H MOV A,71H CJNE A,#0AH,RETURN MOV 71H,#00H INC 72H MOV A,72H CJNE A,#0AH,RETURN MOV 72H,#00H INC 73H MOV A,73H CJNE A,#0AH,RETURN MOV 73H,#00H INC 74H MOV A,74H CJNE A,#0AH,RETURN MOV 74H,#00H INC 75H MOV A,75H CJNE A,#0AH,RETURN MOV 75H,#00H RETURN: RETDISPLAY: MOV R1,#70h ;指向显示缓冲区的首地址 MOV R5,#00h ;数码管显示从最低位开始play: MOV A,R5 MOV p2,A MOV A,R1 MOV DPTR,#TAB MOVC A,A+DPTR MOV p0,A LCALL dl5ms INC R1 INC R5 CJNE R5,#06h,play RET;1ms 延时程序,LED显示用dl5ms: PUSH 06h PUSH 07h MOV R6,#32hdl1: MOV R7,#10hdl2: DJNZ R7,dl2 DJNZ R6,dl1 NOP NOP NOP POP 07h POP 06h RET TAB: DB 0C0h,0F9h,0A4h,0B0h,099h,092h,082h,0F8h,080h,90h ;0 1 2 3 4 5 6 7 8 9 不亮三、出租车计费汇编程序： ORG 0000H LJMP START ORG 0030HSTART: MOV 70H,#05H MOV 71H,#00H MOV 72H,#00H MOV 73H,#00H MOV 74H,#05H MOV 75H,#00H MOV R3,#50H MOV TL1,#0FFH START1: MOV TMOD,#50H SETB TR1 LCALL DISPLAY MOV R4,TL1 CJNE R4,#00H,START1 MOV TL1,#0FFH INC 69H MOV A,69H CLR C SUBB A,#05H JC START1 LCALL BCD LJMP START1 BCD: LCALL T4 MOV TL1,#0FFH INC 70H MOV A,70H CJNE A,#0AH,RETURN MOV 70H,#00H INC 71H MOV A,71H CJNE A,#0AH,RETURN MOV 71H,#00H INC 72H MOV A,72H CJNE A,#0AH,RETURN MOV 72H,#00H RETURN: RET T4: MOV A, R3 ADD A, #08H DA A JNC T5 INC 75H T5: MOV R3,A MOV A,R3 ANL A,#0FH MOV 73H,A MOV A,R3 ANL A,#0F0H SWAP A MOV 74H,A RET DISPLAY: mov A,#00H mov p2,A mov A,70H mov DPTR,#TAB movc A,A+DPTR mov p0,A lcall dl5ms mov A,#01H mov p2,A mov A,71H mov DPTR,#TAB movc A,A+DPTR mov p0,A lcall dl5ms mov A,#02H mov p2,A mov A,72H mov DPTR,#TAB movc A,A+DPTR mov p0,A lcall dl5ms mov A,#03H mov p2,A mov A,73H mov DPTR,#TAB movc A,A+DPTR mov p0,A lcall dl5ms mov A,#04H mov p2,A mov A,74H mov DPTR,#TAB movc A,A+DPTR ANL A,#7FH mov p0,A lcall dl5ms mov A,#05H mov p2,A mov A,75H mov DPTR,#TAB movc A,A+DPTR mov p0,A lcall dl5ms ;mov p0,#0ffh ;消隐 RET;1ms 延时程序,LED显示用dl5ms: PUSH 06h PUSH 07h