接口課設(shè)_數(shù)字時鐘_鬧鐘課設(shè)_微機(jī)原理與接口技術(shù)ｗｗｗ．ｕｕ９ｉ．ｃｏｍ(文件)
【正文】 MOV AX,0000H OUT DX,AX MOV AX,0000H ?；謴?fù)INTR原中斷屏蔽寄存器的屏蔽字 MOV AL,IM_BAK OUT DX,AL STI MOV AX,4C00H 。判別時鐘狀態(tài) CMP AL,0 JZ SS0 CMP AL,1 JZ SS1 CMP AL,2 JZ SS2 JMP OVERSS0: 。軟計時 CMP BL,AL JAE TSET ADD BL,1 MOV NUM,BL JMP OVERTSET: MOV NUM,0AC: MOV AL,[SI] 。設(shè)置秒\分高位顯示 ADD AL,1 CMP AL,6 JNZ AA 。向PC機(jī)內(nèi)部8259發(fā)送中斷結(jié)束命令 MOV AL,20H OUT DX,AL MOV AL,20H OUT 20H,AL IRETTIMESTEP ENDP。顯示鍵值子程序 PUSH AX 。將鍵值作為偏移和鍵值基地址相加得到相應(yīng)的鍵值 MOV DX,MY8255_B OUT DX,AL 。顯示完，返回 ROL AL,1 MOV DL,AL JMP AGAIN 。段位置0即可清除數(shù)碼管顯示 MOV AL,00H OUT DX,AL POP AX POP DX RETCLEAR ENDP。設(shè)置中斷屏蔽寄存器，打開INTR的屏蔽位 IN AL,DX AND AL,INTR_IM OUT DX,AL STISK_END: POP DX POP AX RETSCAN_KK ENDP。掃描82255的C口低4位，檢測時鐘狀態(tài)，并進(jìn)入相應(yīng)模式 PUSH AX PUSH DX MOV DX,MY8255_C IN AL,DX AND AL,03H CMP AL,0 JZ S0 CMP AL,02H JZ S1 CMP AL,01H JZ S2 CMP AL,03H JZ S3 JMP SK_ENDS0: MOV T_STATE,0 JMP O_INTS1: MOV T_STATE,1 JMP O_INTS2: MOV T_STATE,2 JMP O_INTS3: MOV T_STATE,3 MOV DX,INTR_OCW1 。===============================CLEAR PROC NEAR 。取下一個鍵值 POP DX MOV AL,DL TEST AL,08H 。設(shè)置X1～X4，選通一個數(shù)碼管 MOV AL,[SI] 。軟件延時子程序 PUSH CX PUSH AX MOV CX,0FFHD1: MOV AX,0140HD2: DEC AX JNZ D2 LOOP D1 POP AX POP CX RETDALLY ENDP。滿6向前進(jìn)1 MOV [SI],AL INC SI LOOP AC JMP OVERAA: MOV [SI],ALOVER: CALL DIS MOV DX,PCI_INTCSR SUB DX,19H IN AL,DX MOV DX,PCI_INTCSR 。不滿10，跳到AA MOV AL,0H 。設(shè)
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鄂ICP備17016276號-1