【正文】 大連：大連理工大學(xué)， 2020 .具有 PID自整定功能的溫度控制器研究與實現(xiàn) [D].大連：大連理工大學(xué)， 2020 .基于 PWM技術(shù)的電動機(jī)模擬器 [D].天津：天津大學(xué)， 2020 ，姜軍生，趙文亮，孫學(xué)巖 .基于單片機(jī)的直流電機(jī) PWM調(diào)速系統(tǒng) [J].農(nóng)業(yè)化研究，2020 28 附錄一 系統(tǒng)原理圖 A7 A7A6 A6A5 A5A4 A4A3 A3A2 A2A1 A1A0 A0S7B7B6B5B4B3B2B1B0S6S5S4S3S2S1S0B0B1B2B3B4B5B6B7S0S1S2S3S4S5S6S7X T A L 218X T A L 119A L E30EA31P S E N29RS T9P 0 .0 /A D 039P 0 .1 /A D 138P 0 .2 /A D 237P 0 .3 /A D 336P 0 .4 /A D 435P 0 .5 /A D 534P 0 .6 /A D 633P 0 .7 /A D 732P 1 . 01P 1 . 12P 1 . 23P 1 . 34P 1 . 45P 1 . 56P 1 . 67P 1 . 78P 3 .0 /R X D10P 3 .1 /T X D11P 3 .2 /I NT 012P 3 .3 /I NT 113P 3 .4 /T 014P 3 .7 / R D17P 3 . 6 / W R16P 3 .5 /T 115P 2 .7 /A 1 528P 2 .0 / A 821P 2 .1 / A 922P 2 .2 /A 1 023P 2 .3 /A 1 124P 2 .4 /A 1 225P 2 .5 /A 1 326P 2 .6 /A 1 427U1A T 8 9 C5 1S S E TM S E TH S E TA02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19A B / B A1U27 4 L S 2 4 5 29 附錄二 元件清單 序號 名稱 型號規(guī)格 數(shù)量 1 單片機(jī) AT89C51 1片 2 譯碼驅(qū)動器 74LS245 1片 3 LED數(shù)碼管 7SEGMPX8CCBLUE 1個 4 按鍵 BUTTON 3個 5 導(dǎo)線 若干 30 附錄三 程序清單 S_SET BIT 。數(shù)字鐘秒控制位 M_SET BIT 。分鐘控制位 H_SET BIT 。小時控制位 SECOND EQU 30H MINUTE EQU 31H HOUR EQU 32H TCNT EQU 34H ORG 00H SJMP START ORG 0BH LJMP INT_T0 START: MOV DPTR,TABLE MOV HOUR,0 。初始化 MOV MINUTE,0 MOV SECOND,0 MOV TCNT,0 MOV TMOD,01H 。置 T0為計數(shù)器方式 1 MOV TH0,(6553650000)/256 。定時 50毫秒 MOV TL0,(6553650000)MOD 256 MOV IE,82H SETB TR0 。啟動 T0工作 A1: LCALL DISPLAY JNB S_SET,S1 JNB M_SET,S2 JNB H_SET,S3 LJMP A1 S1: 31 LCALL DELAY 。去抖動 JB S_SET,A1 INC SECOND 。秒值加 1 MOV A,SECOND CJNE A,60,J0 。判斷是否加到 60秒 MOV SECOND,0 LJMP J0 S2: LCALL DELAY JB M_SET,A1 K1: INC MINUTE 。分鐘值加 1 MOV A,MINUTE CJNE A,60,J1 。判斷是否加到 60分 MOV MINUTE,0 LJMP J1 S3: LCALL DELAY JB H_SET,A1 K2: INC HOUR 。小時值加 1 MOV A,HOUR CJNE A,24,J2 。判斷是否加到 24小時 MOV HOUR,0 LJMP J2 J0: JB S_SET,A1 LCALL DISPLAY SJMP J0 J1: JB M_SET,A1 LCALL DISPLAY 32 SJMP J1 J2: JB H_SET,A1 LCALL DISPLAY SJMP J2 INT_T0: MOV TH0,(6553650000)/256 MOV TL0,(6553650000)MOD 256 INC TCNT MOV A,TCNT CJNE A,20,RETUNE 。計時 1秒 INC SECOND MOV TCNT,0 MOV A,SECOND CJNE A,60,RETUNE INC MINUTE MOV SECOND,0 MOV A,MINUTE CJNE A,60,RETUNE INC HOUR MOV MINUTE,0 MOV A,HOUR CJNE A,24,RETUNE MOV HOUR,0 RETUNE: RETI DISPLAY: MOV A,SECOND 。顯示秒 MOV B,10 DIV AB CLR MOVC A, @A+DPTR 33 MOV P0, A LCALL DELAY SETB MOV A,B CLR MOVC A,@A+DPTR MOV P0,A LCALL DELAY SETB CLR MOV P0,40H 。顯示分隔符 LCALL DELAY SETB MOV A,MINUTE 。顯示分鐘 MOV B,10 DIV AB CLR MOVC A,@A+DPTR MOV P0,A LCALL DELAY SETB MOV A,B CLR MOVC A,@A+DPTR MOV P0,A LCALL DELAY SETB CLR MOV P0,40H 。顯示分隔符 LCALL DELAY SETB MOV A,HOUR 。顯示小時 MOV B,10 DIV AB 34 CLR MOVC A,@A+DPTR MOV P0,A LCALL DELAY SETB MOV A,B CLR MOVC A,@A+DPTR MOV P0,A LCALL DELAY SETB RET TABLE: DB 3FH,06H,5BH,4FH,66H DB 6DH,7DH,07H,7FH,6FH DELAY: MOV R6,10 D1: MOV R7,250 DJNZ R7,$ DJNZ R6,D1 RET END 35 畢業(yè)設(shè)計（論文）成績評定表 系別： 填表日 期： 年 月 日 學(xué)生姓名 學(xué)號 班級 設(shè)計（論文）題目 單片機(jī)數(shù)字時鐘設(shè)計 指導(dǎo)教師意見： 指導(dǎo)教師 職稱 成績 36 g an employment tribunal clai 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 i. 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 t