文件名称:z2005122812256
- 所属分类:
 - 单片机(51,AVR,MSP430等)
 - 资源属性:
 - [PPT]
 - 上传时间:
 - 2012-11-26
 - 文件大小:
 - 90kb
 - 下载次数:
 - 0次
 - 提 供 者:
 - 周**
 - 相关连接:
 - 无
 - 下载说明:
 - 别用迅雷下载,失败请重下,重下不扣分!
 
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介绍说明--下载内容均来自于网络,请自行研究使用
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相关搜索: 8253
MOV
z2005122812256
			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相关搜索: 8253
MOV
z2005122812256
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z2005122812256.ppt