基于89C51的倒计时牌设计-课程设计

1概述.....................1.1研究背景...................................1.2设计思想及基本功能.........................2总体方案设计..................................................22.1方案选取.................................................22.2系统框图.................................................32.3总体方案设计.............................................33硬件电路设计............................................3.2晶振电路.................................................53.3复位电路.................................................63.4键盘电路.................................................73.5显示电路.................................................74系统软件设计........................................4.1主程序软件设计..........................................124.2键盘程序设计............................................134.3定时程序设计............................................134.4报警程序设计............................................155Proteus仿真........................................6总结............................................参考文献................路灯的短暂倒计时，当你玩游戏时游戏时间结束的倒计时„..，而这些不同功量轻、耗电省、可靠性高、价格低等优点，开始不断发展，AT89C51单片机是该倒计时牌采用廉价可靠的LED数码管显示，能够根据使用合实际情况设置不同时间长度的倒计时，在设定的倒计启动报警装置，并且显示恢复到初始状态。利用专业的单片机仿真软件离上对视觉上的观察有一定的困难。基于以图2.1a方案（二）LCD1602液晶显示器图2.1b方案（二）12864液晶显示器图2.2方案（三）LED数码管实物图图2.6倒计时牌结构框图图3.2单片机晶振电路图然后继续从0000H单元开始执行程序。在复位电路中提供机输入指令，其中主要包括设定时间功能，是以及定时器的启动。K2键，其作用主要是用于时间调整；复位键主要应图3.6LED数码管显示原理图3.8MAX7219的时序图•INIT:MOVA,#0FBHMOVB,#07HLCALLSENDMOVA,BLCALLSENDSETBP2.1MOVA,#0F9HMOVB,#00HLCALLSENDMOVA,BLCALLSENDSETBP2.1MOVA,#0FAHMOVB,#0CHLCALLSENDMOVA,BLCALLSENDSETBP2.1LCALLSENDMOVA,#0FCHMOVB,#01HLCALLSENDMOVA,BLCALLSENDSETBP2.1SEND:CLRP2.1MOVR4,#08HLP1:RLCAMOVP2.0,CCLRP2.2NOPNOPNOPNOPNOPSETBP2.2DJNZR4,LP1RET图图3.10蜂鸣器的驱动电路体的程序代码见附录。系统软件设计主要包括单片机初始化程序、显示子程图图4.1主程序流程图此时逻辑电平是不稳的，如果得不到正确处理的错误执行。但本次设计中键盘的主要是利用图4.2键盘程序流程图图图4.3定时程序流程图需求选择等待下一次倒计时开始或倒计时结束。如下图4.4给出图4.4报警程序流程图图图5.2倒计时时间设置图5.3a倒计时时间显示1图5.3b倒计时时间显示2图5.4倒计时结束仿真图进一步的巩固了单片机基础知识。刚拿到题目的学习单片机的时候做过类似的题目，不过那时做小工程基础，但在本次倒计时牌设计中还是遇到液晶显示屏，但后来发现LCD液晶显示屏显示的字体太小、显示功能其次，是在硬件电路的设计中，原本采用的是LED数码管的静态显示，但在实际搭建电路的时候，软件的图纸根本放不下8位数码管，即便使用总线、网络标号电路也略显复杂。因此，我最终决定的一个驱动芯片-----MAX7219。MAX7219虽然功能实现上相对较难，但它极大悉驾轻就熟的C语言，还是对硬件电路理解比较深的汇编•LEDBITP1.7BUZZERBITP1.0LJMPMAINORG0003HLJMPINT_0ORG000BHORG0013HLJMPINT_1ORG0100HMAIN:LCALLINITCLRP1.0MOV30H,#00HMOV31H,#00HMOV32H,#00HMOV33H,#00HMOVR1,#00HMOVR2,#00HMOVR3,#20MOVTMOD,#01HMOVTH0,#3CHMOVTL0,#0B0HSETBEX0SETBET0SETBEX1LCALLZMZHINIT:MOVA,#0FBHMOVB,#07HLCALLSENDMOVA,BLCALLSENDSETBP2.1MOVA,#0F9HMOVB,#00HLCALLSENDMOVA,BLCALLSENDSETBP2.1MOVA,#0FAHMOVB,#0CHLCALLSENDMOVA,BLCALLSENDSETBP2.1LCALLSENDMOVA,#0FCHMOVB,#01HLCALLSENDMOVA,BLCALLSENDSETBP2.1RETCAIFEN:MOVB,#10DIVABMOVCA,@A+DPTRRETZMZH:MOVDPTR,#TABMOVA,33HACALLCAIFENMOV46H,AMOVA,BMOVCA,@A+DPTRMOV47H,AMOVA,32HACALLCAIFENMOV44H,AMOVA,BMOVCA,@A+DPTRMOV45H,AMOVA,31HACALLCAIFENMOV42H,AMOVA,BMOVCA,@A+DPTRMOV43H,AMOVA,30HACALLCAIFENMOV40H,AMOVA,BMOVCA,@A+DPTRMOV41H,ADISPLAY:MOVA,#00HMOV48H,#08HMOV49H,#08HMOVR0,#47HLP3:MOVA,48HLCALLSENDMOVA,@R0LCALLSENDSETBP2.1LCALLDELAYDEC48HDECR0DJNZ49H,LP3RETSEND:CLRP2.1MOVR4,#08HLP1:RLCAMOVP2.0,CCLRP2.2NOPNOPNOPNOPNOPSETBP2.2DJNZR4,LP1RETLCALLBZDELAYCLRLEDLCALLBZDELAYRETINT_0:PUSHPSWCJNER1,#05H,RE1SETBTR0MOVR1,#00HMOVR2,#0FFHRETIIT_0:MOVTH0,#3CHMOVTL0,#0B0HACALLDJSHIRETIINT_1:PUSHPSWPUSHACCCJNER1,#00H,TIMCHRETURN:POPACCPOPPSWRETITIMCH:CJNER1,#01H,MIAOMOVA,33HLCALLZMZHCJNEA,#60,RETURNMOV33H,#00HSJMPRETURNMIAO:CJNER1,#02H,FENMOVA,32HLCALLZMZHCJNEA,#60,RETURNMOV32H,#00HRETFEN:CJNER1,#03H,SHIMOVA,31HLCALLZMZHCJNEA,#24,RETURNMOV31H,#00HSJMPRETURNSHI:CJNER1,#04,RETURNMOVA,30HLCALLZMZHCJNEA,#100,RETURNMOV30H,#00HRETDELAY:MOV34H,#14HLP2:MOV35H,#8AHDJNZ35H,$DJNZ34H,LP2RETDJSHI:DJNZR3,LP4MOVR3,#20LCALLZMZHMOVA,33HCJNEA,#0FFH,LP4MOV33H,#3BHLCALLZMZHMOVA,32HCJNEA,#0FFH,LP4MOV32H,#3BHLCALLZMZHMOVA,31HCJNEA,#0FFH,LP4MOV31H,#17HLCALLZMZHMOVA,30HCJNEA,#0FFH,LP4CLRTR0MOV30H,#00HLCALLZMZHMOV31H,#00HLCALLZMZHMOV32H,#00HLCALLZMZHMOV33H,#00HLCALLZMZHLCALLFMLP4:RETBZDELAY:MOV36H,#0FAHL1:MOV37H,#0FAHL2:DJNZ37H,L2DJNZ36H,L1RETTAB:DB7EH,30H,6DH,79H,33H,5BH,5FH,70H,7FH,7BHEND:1001000012012FC2907530007531007532007533C1:100110000079007A0073C758AB072:10012000D2AFD2A8D288D2A9D2AAD28A120175742B:10013000FB75F0071201C3E5F01201C3D2A174F9F7:1001400075F0001201C3E5F01201C3D2A174FA7573:10015000F00C1201C3E5F01201C3D2A11201C37465:10016000FC75F0011201C3E5F01201C3D2A12275A2:10017000F00A8493229002B8E533316FF546E5F03A:1001800093F547E532316FF544E5F093F545E531F8:10019000316FF542E5F093F543E530316FF540E519:1001A000F093F54174007548087549087847E548AB:1001B0001201C3E61201C3D2A112024B154818D591:1001C00049EC22C2A17C083392A0C2A20000000028:1001D00000D2A2DCF222D2901202ABC2971202AB82:1001E00022C0D009B90506D28C79007AFFD0D0326E:1001F000758C3C758AB0515832C0D0C0E0B900054A:10020000D0E0D0D032B9010F0533E533120175B417:100210003CEE75330080E9B9020E0532E532120179:1002200075B43CDC75320022B9030F0531E531129B:100230000175B418CB75310080C6B904C30530E52B:1002400030120175B464B9753000227534147535F7:10025000