文件名称:z2005122812256
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8253的初始化程序举例:
例1：选择2号计数器，工作在3方式，计数初值为533H（2个字节），采用二进制计数。其初始化程序段为
MOV DX，307H ；命令口
MOV AL，10110110B ；2号计数器的初始化命 令字
OUT DX，AL ；写入命令寄存器
MOV DX，306H ；2号计数器数据口
MOV AX，533H ；计数初值
OUT DX，AL ；选送低字节到2号计数器
MOV AL，AH ；取高字节送AL
OUT DX，AL ；后送高字节到2号计数器
-8253 initialization procedures examples : Example 1 : Select counters on the 2nd, in three ways. Counting for the initial 533H (2 bytes), a binary counting. Initialization of its procedures for MOV DX, 307H; I ordered MOV AL, 10110110B; on the 2nd Counter initialize command word OUT DX, AL; write commands Register MOV DX, 306H; data on the 2nd Counter I MOV AX, 533H; Counting initial OUT DX, AL; low-byte sent to the 2nd Counter MOV AL, AH; With a high-byte send AL OUT DX, AL; evacuations high byte counter to the 2nd
例1：选择2号计数器，工作在3方式，计数初值为533H（2个字节），采用二进制计数。其初始化程序段为
MOV DX，307H ；命令口
MOV AL，10110110B ；2号计数器的初始化命 令字
OUT DX，AL ；写入命令寄存器
MOV DX，306H ；2号计数器数据口
MOV AX，533H ；计数初值
OUT DX，AL ；选送低字节到2号计数器
MOV AL，AH ；取高字节送AL
OUT DX，AL ；后送高字节到2号计数器
-8253 initialization procedures examples : Example 1 : Select counters on the 2nd, in three ways. Counting for the initial 533H (2 bytes), a binary counting. Initialization of its procedures for MOV DX, 307H; I ordered MOV AL, 10110110B; on the 2nd Counter initialize command word OUT DX, AL; write commands Register MOV DX, 306H; data on the 2nd Counter I MOV AX, 533H; Counting initial OUT DX, AL; low-byte sent to the 2nd Counter MOV AL, AH; With a high-byte send AL OUT DX, AL; evacuations high byte counter to the 2nd
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