自動溫控系統(tǒng)ppt課件-資料下載頁
2025-01-17 09:50本頁面
【正文】 mov cx, 0600h 。循環(huán)次數(shù) loop1: push di mov bh , 01h mm: mov byte ptr bz, bh mov si, offset led mov bl, [di] 。bl為要顯示的數(shù) and bh, 0 。置 led數(shù)碼表偏移地址為 SI add si, bx 。求出對應(yīng)的 led數(shù)碼 mov dx , io8255b 。自 8255A的口輸出 mov al, byte ptr bz $ out dx, al cmp al, 02h jnz mm1 mov al, byte ptr [si] or al, 80h 。點亮小數(shù)點 jmp mm2 mm1: mov al, byte ptr [si] mm2: mov dx, io8255a out dx, al push cx mov cx, 200 。延時 delay2: loop delay2 pop cx inc di 。di自加 1 mov al, 00h out dx, al mov bh, byte ptr bz shl bh, 1 cmp bh, 08h jnz mm 。若 bh不等于 08h，繼續(xù) mm循環(huán) pop di 。若 bh為 08h，向下執(zhí)行， di出棧 $ loop loop1 show endp soundon proc near mov dx, io8254a mov ax, buf3 out dx, al 。低八位輸出 mov al, ah out dx, al 。高八位輸出 mov dx, io8255c mov al, buf4 out dx, al 。8055c端口輸出 ret soundon endp soundoff proc near mov dx, io8255c mov al, 00h 。8254out0輸出 0，關(guān)閉報警 out dx, al ret soundoff endp $ coolon proc near mov al, 80h mov dx, io0832a out dx, al mov cx, buf1 delay3: loop delay3 。低電平延遲 mov al, 0ffh mov dx, io0832a out dx, al mov cx, buf2 delay4: loop delay4 。高電平延遲 ret coolon endp cooloff proc near mov al, 80h mov dx, io0832a 。0832輸出低電平 out dx, al 。關(guān)閉降溫系統(tǒng) ret cooloff endp code ends end start $ 謝謝觀看
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