【文章內(nèi)容簡介】 秀清 .微型計 算機原理與接口技術(shù) .中國科學(xué)技 術(shù)大學(xué)出版社 .2021. [9] 萬方數(shù)據(jù)知識服務(wù)平臺 . [10]百度 . [11]維普期刊資源整合 服務(wù)平臺 . [12]EBSOC 外文論文數(shù)據(jù)庫 . [13]中文科技期刊 . 附 錄 系統(tǒng)程序 。********************************** FLAG1 BIT F0 。DS18B20 存在標(biāo)志位 DQ BIT TEMPER_L EQU 29H TEMPER_H EQU 28H A_BIT EQU 35H B_BIT EQU 36H 。************程序起始 ******************** ORG 0000H AJMP MAIN ORG 0100H 。**************主程序開始 ************ MAIN: LCALL INIT_18B20 LCALL RE_CONFIG LCALL GET_TEMPER AJMP CHANGE 。**********DS18B20 復(fù)位程序 ***************** INIT_18B20: SETB DQ NOP CLR DQ MOV R0, 0FBH TSR1: DJNZ R0,TSR1 。延時 SETB DQ MOV R0, 25H TSR2: JNB DQ, TSR3 DJNZ R0, TSR2 TSR3: SETB FLAG1 。置標(biāo)志位，表明 DS18B20 存在 CLR 。二極管指示 AJMP TSR5 TSR4: CLR FLAG1 LJMP TSR7 TSR5: MOV R0, 06BH TSR6: DJNZ R0, TSR6 TSR7:SETB DQ 。表明不存在 RET 。********************設(shè)定 DS18B20 暫存器設(shè)定值 ************** RE_CONFIG: JB FLAG1, RE_CONFIG1 RET 。RE_CONFIG1: MOV A,0CCH 。放跳過 ROM 命令 LCALL WRITE_18B20 MOV A, 4EH LCALL WRITE_18B20 。寫暫存器命令 MOV A, 00H 。報警上限中寫入 00H LCALL WRITE_18B20 MOV A, 00H 。報警下限中寫入 00H LCALL WRITE_18B20 MOV A,1FH 。選擇九位溫度分辨率 LCALL WRITE_18B20 RET 。*****************讀轉(zhuǎn)換后的溫度值 **************** GET_TEMPER: SETB DQ LCALL INIT_18B20 JB FLAG1, TSS2 RET 。若不存在則返回 TSS2: MOV A,0CCH 。跳過 ROM LCALL WRITE_18B20 MOV A,44H 。發(fā)出溫 度轉(zhuǎn)換命令 LCALL WRITE_18B20 LCALL DISPLAY 。延時 LCALL INIT_18B20 MOV A,0CCH 。跳過 ROM LCALL WRITE_18B20 MOV A,0BEH 。發(fā)出讀溫度換命令 LCALL WRITE_18B20 LCALL READ2_18B20 。讀兩個字節(jié)的溫度 RET 。***************寫 DS18B20 程序 ************ WRITE_18B20: MOV R2, 8 CLR C WR1: CLR DQ MOV R3, 6 DJNZ R3, $ RRC A MOV DQ, C MOV R3, 23 DJNZ R3, $ SETB DQ NOP DJNZ R2, WR1 SETB DQ RET 。***********讀 18B20 程序，讀出兩個字節(jié)的溫度 ********* READ2_18B20: MOV R4,2 。低位存在 29 H,高位存在28H MOV R1,29H RE00: MOV R2, 8 RE01: CLR C SETB C NOP NOP CLR DQ NOP NOP NOP SETB DQ MOV R3, 7 DJNZ R3, $ MOV C, DQ MOV R3, 23 DJNZ R3, $ RRC A DJNZ R2, RE01 MOV @R1, A DEC R1 DJNZ R4, RE00 RET 。************讀出的溫度進行數(shù)據(jù)轉(zhuǎn)換 ************** CHANGE: MOV A, 29H MOV C, 。將 28H 中的最低位移入 C RRC A MOV C, RRC A MOV C, RRC A MOV C, RRC A MOV 29H, A SETB LCALL DISPLAY 。調(diào)用數(shù)碼管顯示子程序 SETB LJMP MAIN 。*******************DISPLAY****** DISPLAY: MOV a, 29H。將 29H 中的十六進制數(shù)轉(zhuǎn)換成 10進制 MOV b, 10 。10 進制 /10=10 進制 DIV AB MOV B_BIT, a 。十位在 a MOV A_BIT, b 。個位在 b MOV DPTR, TAB 。指定查表啟始地址 MOV R0, 4 DPL1: MOV R1, 250 。顯示 1000 次 DPLOP: MOV A, A_BIT 。取個位數(shù) MOVC A,@A+DPTR 。查個位數(shù)的 7段代碼 MOVE P0,a 。送出個位的 7段代碼 CLR 。開個位顯示 ACALL d1ms 。顯示 1ms SETB MOV A,B_BIT 。取十位數(shù) MOVC A,@A+DPTR 。查十位數(shù)的 7段代碼 MOV p0,a 。送出十位的 7段代碼 CLR 。開 十位顯示 ACALL d1ms 。顯示 1ms SETB DJNZ r1,dplop 。100 次沒完循環(huán) DJNZ r0,dpl1 。4 個 100 次沒完循環(huán) RET 。*********************************** D1MS: MOV R7,80 。1MS 延時 (按 12MHZ 算 ) DJNZ R7, $ RET 。************************* TAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H 后 記 這次畢業(yè)設(shè)計歷時一個多月，從一開始的確定課題，到后來的資料查找、理論學(xué)習(xí)，和同學(xué)們的探討，這一切都使我的理論知識有了進一步提高。 通過本次對一線式多點溫度采集系統(tǒng)的設(shè)計 ,我大有收獲。從得到題目到查找資料，在這一個充滿挑戰(zhàn)伴隨挫折，充滿熱情伴隨打擊的過程中，我感觸頗深，它已不僅是一個對我三年學(xué)習(xí)知識情況的檢驗，而且還是對我的鉆研精神，面對困難的心態(tài)，做事的毅力和耐心的考驗。我在這個過程中深刻的感受到了做畢業(yè)設(shè)計的意義所在。 通過完成本課題，我了解并掌握了傳感器的基本理論知識，更深 入的掌握單片機在實際電路中的開發(fā)和應(yīng)用。為以后從事單片機軟硬件產(chǎn)品的設(shè)計開發(fā)打下了一定的基礎(chǔ)，培養(yǎng)了從事產(chǎn)品研發(fā)的信心。 在本畢業(yè)設(shè)計的設(shè)計和制作過程中，很多同學(xué)、老師都熱心地幫助了我，給了我很大的鼓勵，在此表示衷心的感謝。在論文的寫作過程中，我得到了學(xué)校、系、老師和同學(xué)的大力幫助和支持。特別感謝指導(dǎo)老師藺老師對我的悉心指導(dǎo)，他給了我許多有益的建議和意見，使我的思維得到了進一步開闊。我的同學(xué)也在我的論文寫作中給了我很大的啟發(fā)。在此特向給予我?guī)椭乃腥吮硎菊\摯的謝意。 g an employment tribunal claim Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept it. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals.