基于單片機(jī)的簡(jiǎn)易電子時(shí)鐘設(shè)計(jì)(專(zhuān)業(yè)版)
【正文】 Stevens,范建華譯. TCP/IP詳解卷1：協(xié)議[M]. 機(jī)械工業(yè)出版社，2000[5] Androw S. Tanenbaum. 計(jì)算機(jī)網(wǎng)絡(luò)（第4版）[M]. Pearson，2004[6]在主程序中，對(duì)不同的按鍵進(jìn)行掃描，實(shí)現(xiàn)秒表，時(shí)間調(diào)整，復(fù)位清零等功能，系統(tǒng)總流程圖如下圖7：圖 7 系統(tǒng)總體流程圖 源程序清單 ORG 0000H MOV 30H,1 ，分配顯示數(shù)據(jù)內(nèi)存 MOV 31H,2 MOV 32H,0 MOV 33H,0 MOV 34H,0 MOV 35H,0 MOV TMOD,01 啟動(dòng)計(jì)數(shù)器XS0: SETB TR0 使 TRO位置1 MOV TH0,00H 計(jì)數(shù)器置零 MOV TL0,00HXS: MOV 40H,0FEH 掃描控制字初值 MOV DPTR,TAB 取段碼表地址 MOV P2,40H 從P2口輸出 MOV A,30H 取顯示數(shù)據(jù)到A MOVC A,A+DPTR 查顯示數(shù)據(jù)對(duì)應(yīng)段碼 MOV P0,A 段碼放入P0中 LCALL YS1MS 顯示1MS MOV P0,0FFH PO端口清零 MOV A,40H 取掃描控制字放入A中 RL A A中數(shù)據(jù)循環(huán)左移 MOV 40H,A 放回40H地址段內(nèi) MOV P2,40H MOV A,31H ADD A,10 進(jìn)位顯示 MOVC A,A+DPTR MOV P0,A LCALL YS1MS MOV P0,0FFH MOV A,40H RL A MOV 40H,A MOV P2,40H MOV A,32H MOVC A,A+DPTR MOV P0,A LCALL YS1MS MOV P0,0FFH MOV A,40H RL A MOV 40H,A MOV P2,40H MOV A,33H ADD A,10 MOVC A,A+DPTR MOV P0,A LCALL YS1MS MOV P0,0FFH MOV A,40H RL A MOV 40H,A MOV P2,40H MOV A,34H MOVC A,A+DPTR MOV P0,A LCALL YS1MS MOV P0,0FFH MOV A,40H RL A MOV 40H,A MOV P2,40H MOV A,35H MOVC A,A+DPTR MOV P0,A LCALL YS1MS MOV P0,0FFH MOV A,40H RL A MOV 40
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