92 lines
2.7 KiB
NASM
Executable File
92 lines
2.7 KiB
NASM
Executable File
DATA SEGMENT
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EIGHT DB 7FH
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TWO DB 5BH
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FIVE DB 6DH
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BAR DB 40H
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A DB 77H
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T DW 0FFH
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DATA ENDS
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CODE SEGMENT
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ASSUME CS:CODE, DS:DATA
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START:
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MOV AX, DATA
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MOV DS, AX
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MOV DX, 283H ; 命令口
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MOV AL, 10000000B ; 1|00(A组0方式)|0(PA输出)|0(PC4-7输出)|0(B组0方式)|0(PB输出)|0(PC0-3输出)
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OUT DX, AL
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LP:
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MOV DX, 280H ; A口，控制位码
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MOV AL, 10000000B ; 第1位，PA1置1
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OUT DX, AL
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MOV DX, 281H ; B口，控制段码
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MOV AL, EIGHT ; 输出数据段定义的字符“8”
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OUT DX, AL
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CALL DELAY ; 延时后清零
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MOV DX, 280H
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MOV AL, 01000000B ; 第2位，PA2置1
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OUT DX, AL
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MOV DX, 281H
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MOV AL, TWO ; 输出数据段定义的字符“2”
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OUT DX, AL
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CALL DELAY
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MOV DX, 280H
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MOV AL, 00100000B ; 第3位，PA3置1
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OUT DX, AL
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MOV DX, 281H
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MOV AL, FIVE ; 输出数据段定义的字符“5”
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OUT DX, AL
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CALL DELAY
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MOV DX, 280H
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MOV AL, 00010000B ; 第4位，PA4置1
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OUT DX, AL
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MOV DX, 281H
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MOV AL, FIVE ; 输出数据段定义的字符“5”
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OUT DX, AL
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CALL DELAY
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MOV DX, 280H
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MOV AL, 00001000B ; 第5位，PA5置1
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OUT DX, AL
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MOV DX, 281H
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MOV AL, BAR ; 输出数据段定义的字符“-”
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OUT DX, AL
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CALL DELAY
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MOV DX, 280H
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MOV AL, 00000100B ; 第6位，PA6置1
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OUT DX, AL
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MOV DX, 281H
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MOV AL, A ; 输出数据段定义的字符“A”
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OUT DX, AL
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CALL DELAY
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JMP LP ; 无限循环
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DELAY PROC
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PUSH BX
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MOV BX, T
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DL1:
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DEC BX
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JNZ DL1
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POP BX
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; 将位码段码都置0，否则前一位显示的字符会在显示下一位字符显示前在该位上显示
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MOV DX, 280H
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MOV AL, 00000000B
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OUT DX, AL
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MOV DX, 281H
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MOV AL, 0
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OUT DX, AL
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RET
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DELAY ENDP
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CODE ENDS
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END START |