【正文】 BUF EQU 40H DISPBIT EQU 48H T2SCNTA EQU 49H T2SCNTB EQU 4AH TEMP EQU 4BH ORG 00H LJMP START ORG 0BH LJMP INT_T0 START: MOV SECOND,00H MOV MINITE,00H MOV HOUR,12 MOV DISPBIT,00H MOV T2SCNTA,00H MOV T2SCNTB,00H MOV TEMP,0FEH LCALL DISP ； 2KB 范圍內(nèi)長(zhǎng)調(diào)用 MOV TMOD,01H MOV TH0,(6553620xx) / 256 ； 2ms MOV TL0,(6553620xx) MOD 256 SETB TR0 邵陽(yáng)學(xué)院課程設(shè)計(jì)報(bào) 告 26 SETB ET0 SETB EA WT: JB SECONDK,NK1 ； SECONDK 是 1 轉(zhuǎn) NK1， 即按鍵 SP1按下時(shí)轉(zhuǎn) . LCALL DELY10MS JB SECONDK,NK1 INC SECOND MOV A,SECOND CJNE A,60,NS60 MOV SECOND,00H NS60: LCALL DISP JNB SECONDK,$ NK1: JB MINITEK,NK2 LCALL DELY10MS JB MINITEK,NK2 INC MINITE MOV A,MINITE CJNE A,60,NM60 MOV MINITE,00H NM60: LCALL DISP JNB MINITEK,$ NK2: JB HOURK,NK3 LCALL DELY10MS JB HOURK,NK3 INC HOUR MOV A,HOUR CJNE A,24,NH24 MOV HOUR,00H NH24: LCALL DISP 邵陽(yáng)學(xué)院課程設(shè)計(jì)報(bào) 告 27 JNB HOURK,$ NK3: LJMP WT DELY10MS: MOV R6,10 D1: MOV R7,248 DJNZ R7,$ DJNZ R6,D1 RET DISP: ； 將得出的時(shí)間存入 40H （ DISPBUF） 之后的地址 MOV A,DISPBUF ADD A,8 DEC A MOV R1,A MOV A,HOUR MOV B,10 DIV AB MOV R1,A ； 累加器送內(nèi)部 RAM 單元 R1 與 R1 區(qū)分 ？： R1——R1 為地址 ， R1 指向其內(nèi)容 R1 ——R1 為變量， DEC R1 MOV A,B MOV R1,A DEC R1 MOV A,10 ；輸出符號(hào) “—” MOVR1,A DEC R1 MOV A,MINITE MOV B,10 DIV AB 邵陽(yáng)學(xué)院課程設(shè)計(jì)報(bào) 告 28 MOV R1,A DEC R1 MOV A,B MOV R1,A DEC R1 MOV A,10 MOVR1,A DEC R1 MOV A,SECOND MOV B,10 DIV AB MOV R1,A DEC R1 MOV A,B MOV R1,A DEC R1 RET INT_T0: MOV TH0,(6553620xx) / 256 MOV TL0,(6553620xx) MOD 256 MOV A, 0FFH MOV P3,A MOV A,DISPBUF ADD A,DISPBIT ；地址加，并將時(shí)間的各位送到 P1 MOV R0,A MOV A,R0 MOV DPTR,TABLE MOVC A,A+DPTR MOV P1,A 邵陽(yáng)學(xué)院課程設(shè)計(jì)報(bào) 告 29 MOV A,DISPBIT MOV DPTR,TAB MOVC A,A+DPTR MOV P3,A INC DISPBIT MOV A,DISPBIT CJNE A,08H,KNA MOV DISPBIT,00H KNA: INC T2SCNTA ； ******時(shí)間的增加與進(jìn)位 ****** MOV A,T2SCNTA CJNE A,100,DONE MOV T2SCNTA,00H INC T2SCNTB MOV A,T2SCNTB CJNE A,05H,DONE MOV T2SCNTB,00H INC SECOND MOV A,SECOND CJNE A,60,NEXT MOV SECOND,00H INC MINITE MOV A,MINITE CJNE A,60,NEXT MOV MINITE,00H INC HOUR MOV A,HOUR CJNE A,24,NEXT MOV HOUR,00H NEXT: LCALL DISP 邵陽(yáng)學(xué)院課程設(shè)計(jì)報(bào) 告 30 DONE: RETI TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,40H ； 40H 代表符號(hào) “—” TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH END