微機(jī)原理課程設(shè)計(jì)報(bào)告-資料下載頁(yè)
2024-08-12 12:27本頁(yè)面
【正文】 55_CONOUT DX,AL。中斷MOV AX, 0000HMOV DS, AXMOV AX, OFFSET MIR7 。取中斷入口地址MOV SI, 003CH 。中斷矢量地址MOV [SI], AX 。填 IRQ7 的偏移矢量MOV AX, SEG MIR7 。段地址MOV SI, 003EHMOV [SI], AX 。填 IRQ7 的段地址矢量 。8259 初始化 MOV AL, 13HOUT 20H, AL 。ICW1MOV AL, 08HOUT 21H, AL 。ICW2MOV AL, 03HOUT 21H, AL 。ICW4STIAA1: CALL DISP 。調(diào)用顯示子程序(disp) JMP AA1 。實(shí)現(xiàn)循環(huán)MIR7 PROC STI 。置中斷標(biāo)志位 IF PUSH AX 。壓棧 PUSH SI MOV AX,SEG TIMER 。取 TIMER 的段地址 MOV DS,AX MOV SI,OFFSET TIMER 。取 TIMER 的地址偏移量 MOV AL,[SI] INC AL 。AL 加 1 MOV [SI],AL CMP AL,100 。AL 與 100 相比較 JNE TRNED 。若相等，則跳轉(zhuǎn) MOV AL,0 。不等則向下執(zhí)行 MOV [SI],AL MOV AL,[SI+1] ADD AL,1 DAA 。十進(jìn)制調(diào)整，用于加法 MOV [SI+1],AL CMP AL,60H JNE TRNED MOV AL,0 MOV [SI+1],AL MOV AL,[SI+2] ADD AL,1 DAA MOV [SI+2],AL CMP AL,60H JNE TRNED MOV AL,0 MOV [SI+2],AL MOV AL,[SI+3] ADD AL,1 DAA MOV [SI+3],AL CMP AL,24H JNE TRNED MOV AL,0 MOV [SI+3],AL TRNED: MOV AL,[SI+1] MOV SEC,AL MOV AL,[SI+2] MOV MIN,AL MOV AL,[SI+3] MOV HOUR,AL POP SI 。出棧 POP AX STI 。置中斷標(biāo)志位 IF IRET 。中斷返回 ENDPDISP: PUSH AX PUSH SI MOV DX,MY8255_A MOV AX,SEG TAB MOV DS,AX MOV BX,OFFSET TAB MOV AL,SEC AND AL,0FH 。與低四位相與 MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_B MOV AL,0FEH OUT DX,AL CALL DALLY MOV AL,SEC AND AL,0F0H MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_B MOV AL,0FDH OUT DX,AL CALL DALLY MOV AL,MIN AND AL,0FH MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_B MOV AL,0FBH OUT DX,AL CALL DALLY MOV AL,MIN AND AL,0F0H MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_B MOV AL,0F7H OUT DX,AL CALL DALLY MOV AL,HOUR AND AL,0FH MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_B MOV AL,0EFH OUT DX,AL CALL DALLY MOV AL,HOUR AND AL,0F0H MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_B MOV AL,0DFH OUT DX,AL CALL DALLY POP AX POP SI RET DALLY: PUSH CX MOV CX,0006HT1: MOV AX,009FHT2: DEC AXJNZ T2LOOP T1POP CXRETCODE ENDSEND S
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