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  • HIWORD(DWORD) LOWORD(DWORD)转换为WORD HIBYTE(WORD) LOBYTE(WORD)转换为BYTE

    HIWORD(DWORD) LOWORD(DWORD)转换为WORD

    HIBYTE(WORD) LOBYTE(WORD)转换为BYTE

    展开全文
  • 例如,下面的指令中,用word ptr指明了指令访问的内存单元是一个字单元。 mov word ptr ds: [0],1 inc word ptr [bx] inc word ptr ds: [o] add word ptr [bx],2 下面的指令中,用byte ptr指明了指令访问的内存单元...

    例如,下面的指令中,用word ptr指明了指令访问的内存单元是一个字单元
    mov word ptr ds: [0],1
    inc word ptr [bx]
    inc word ptr ds: [o]
    add word ptr [bx],2
    下面的指令中,用byte ptr指明了指令访问的内存单元是一个字节单元
    mov byte ptr ds: [0],1
    inc byte ptr [bx]
    inc byte ptr ds: [o]
    add byte ptr [bx],2

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  • WORD BYTE 相互转换

    千次阅读 2015-08-26 19:19:28
    //数据转换函数 //WORD to BYTE void CICONV::SetWordToByte(WORD wCardData, BYTE & cbCardData) { BYTE cbColor = wCardData >> 8; if (cbColor == 4) { cbCardData = 0x40|((wCardData & 0x000f) +
    //数据转换函数
    //WORD to BYTE
    void CICONV::SetWordToByte(WORD wCardData, BYTE & cbCardData)
    {
        BYTE cbColor = wCardData >> 8;
        if (cbColor == 4)
        {
            cbCardData = 0x40|((wCardData & 0x000f) + 0x0d);//注意优先级问题
        }
        else
        {
            cbCardData = (cbColor<<4)|(wCardData&0x000f);
        }
    
    }
    
    void CICONV::SetWordToByte(WORD wCardData_[], BYTE cbCardData_[], BYTE cbCount)
    {
        for(int i=0; i<cbCount; i++)
        {
            SetWordToByte(wCardData_[i], cbCardData_[i]);
        }
    }
    
    //BYTE to WORD
    void CICONV::SetByteToWord(BYTE cbCardData, WORD & wCardData)
    {
        BYTE cbColor = cbCardData >> 4;
        if (cbColor == 4)
        {
            wCardData = 0x0400 | ((cbCardData & 0x0F) - 0x0D);
        }
        else
        {
            wCardData = (cbColor<<8) | (cbCardData&0x0f);
        }
    }
    
    void CICONV::SetByteToWord(BYTE cbCardData_[], WORD wCardData_[], BYTE cbCount)
    {
        for(int i=0; i<cbCount; i++)
        {
            SetByteToWord(cbCardData_[i], wCardData_[i]);
        }
    }
    展开全文
  • word addressable and byte addressable

    千次阅读 2009-09-23 22:35:00
    [quote from wikipedia]http://en.wikipedia.org/wiki/Byte_addressing Byte addressing refers to hardware architectures which support accessing individual bytes of data rather than only larger

    [quote from wikipedia]

    http://en.wikipedia.org/wiki/Byte_addressing

     

         Byte addressing refers to hardware architectures which support accessing individual bytes of data rather than only larger units called words.

         The basic unit of digital storage is called a bit. In most common computer architectures, 8 bits are grouped together to form a byte. Byte addressable memory refers to architectures where data can be accessed 8 bits at a time, irrespective of the width of the data and address buses.

         Many common architectures can address more than 8 bits of data at a time. For example, the Intel 386SX processor can handle 16-bit (two-byte) data, since data is transferred over a 16-bit bus. However, data in memory may be of various lengths. A 64-bit architecture machine might still need to access byte-sized data over its 64-bit address line. Such memory, which is accessible in 8-bit segments, is called Byte-Addressable Memory.

     


    [quote from wikipedia]

    http://en.wikipedia.org/wiki/Byte_addressing

     

      

    "Word-addressable is a computer science term.

    In computer science, a word is an ordered set of bytes or bits (typically 2 bytes, or 16 bits) that is the normal unit in which information may be stored, transmitted, or operated on within a given computer.

    Typically, if a processor has a fixed-length instruction set, then the instruction length equals the word length.

     

     

        e.g: 26 bit address line, 16 bit data bus.

        when access in byte-addressable mode, it can access maximum 128 MB data

        when access in word-addressable mode, it can access maximum 256 MB data

     

     

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  • byteword类型。

    千次阅读 2015-05-14 11:40:00
    情况一: 1)单独一个byte转成word byte bb; word ww; ww=(word)bb; //即进行强制类型转换。 情况二: 两个byte转到一个word类型。 Byte bb1; Byte bb2; word ww; ww=((word)bb1
  • BYTE WORD DWORD

    2010-12-28 11:11:00
    一、定义 在VC6.0的Microsoft Visual Studio/VC98/Include/windef.h 里,定义了BYTE,WORD,DWORD typedef unsigned long DWORD; typedef unsigned char BYTE; typedef unsigned short ...
  • bit byte word dword

    2012-09-03 10:44:11
    1byte = 8 bit 一个英文字母(不区分大小写)占一个字节 一个汉字占两个字节 1 word = 2 byte 1 dword = 4 byte unsigned char 与 byte 等同
  • BYTE WORD DWORD

    千次阅读 2008-12-13 12:33:00
    一、定义在VC6.0的Microsoft Visual Studio/VC98/Include/windef.h 里,定义了BYTE,WORD,DWORDtypedef unsigned long DWORD;typedef unsigned char BYTE;typedef unsigned short WORD; 即:BYT
  • byte word dword oword

    2016-03-03 13:09:43
    8 bits Byte 16 bits Word 32 bits Dword 64 bits Qword 128 bits Oword
  • word ptr和byte ptr的寻址方式, 修改data段的数值 assume cs:code, ds:data data segment db 60h dup(0) db 'DEC' db 'Ken Oslen' dw 137h dw 40h db 'PDP' data ends code segment start: mov ax,data ...
  • winform下word文件与byte[]互转

    千次阅读 2014-03-31 16:56:39
    要在数据库中存储word文件免不了要在word文件和二进制数据之间做转换,于是我又手痒写类了。虽然只写了word文件的转换,其实其他各种文件都可以类比下。 using System; using System.Data; using System.Windows....
  • word(byte)ptr

    2011-10-29 11:15:22
    在没有寄存器参与的内存单元访问指令中,用word ptr 或byte ptr 显性地指明所要访问的内存单元的长度 否则,cpu无法得知要访问的单元是字单元还是字节单元。 有些指令默认了访问的是字单元还是字节单元,比如,...
  • WORD & BYTE & 进制转换

    千次阅读 2010-03-16 11:14:00
    1 typedef unsigned char BYTE;typedef unsigned short WORD;定义:BYTE *pszBuf; 现需要将一个十进制数字 N 赋值给两个BYTE,即*pszBuf,*pszBuf(1); 方法一:可以使用如下代码: *((WORD *)pszBuf ) = N; ...
  • bit,byteword,long word转换关系

    千次阅读 2014-02-22 16:21:55
    word,与系统硬件(总线、cpu命令字位数等)有关,如数据总线为16位,则1word为2byte。32位 1word为4byte。 long word的长度 为word的两倍。  存储容量通常用byte表示,因为与系统硬件无关。
  • bit,byte,half-word,word,dword的联系

    千次阅读 2012-06-10 22:19:19
    bit:位 byte:字节 word:字长 ...1 word = 2 byte 1 byte = 8 bit  1 dword = 4 byte  half-word = 2 byte  ebcdic码 32bits = 4 byte  EBCDIC码= extended binary coded decimate interchang
  • public static void Word2Byte(byte[] to, int toIndex, short from) {  to[toIndex] = (byte) (from >> 8);  to[toIndex + 1] = (byte) (from);  }
  • DWORD WORD BYTE 相互转换

    千次阅读 2013-07-18 16:04:23
    DWORD WORD BYTE 相互转换    DWORD 4个字节  WORD 2个字节  BYTE 1个字节   1) DWORD--->WORD [cpp] view plaincopy DWORD dw=0;      WORD hW=HIWORD(dw);  WO
  • VC 数据类型 BYTE WORD DWORD

    千次阅读 2012-11-17 13:32:28
    在VC6.0的Microsoft Visual Studio/VC98/Include/windef.h 里,定义了BYTE,WORD,DWORD typedef unsigned long DWORD; typedef unsigned char BYTE; typedef unsigned short WORD; 即: BYTE:8位
  • BYTE WORD DWORD详解

    千次阅读 2016-11-29 09:48:44
    解释: BYTE:unsigned char 1个字节 范围2^8-1即0-255 WORD:unsigned short。 2个字节 范围2^16-1 即0-65535 DWORD:unsingned long。4个字节 范围2^32-1 即
  • 以下的操作 都是字操作 mov ax,1 mov bx,ds:[0] mov ds,ax mov ds:[0], ax inc ax  add ax,1000 以下的操作 都是字节操作 mov al,1 mov al,bl mov al,ds:[0] mov ds:[0], al ...inc a...
  • BYTEWORD、DWORD

    千次阅读 2017-12-10 21:14:24
    typedef unsigned char BYTE; typedef unsigned short WORD; typedef unsigned long DWORD...BYTE是无符号的char型,WORD是无符号short型,DWORD是无符号long型。     早期Visual C++ 6.0中,char型长度为1字
  • BYTEWORD与DWORD类型

    千次阅读 2020-03-24 15:44:22
    在Visual C++ 6.0中,BYTEWORD,DWORD本质上都是一种无符号整型,它们在WINDEF.H中被定义,定义如下: typedef unsigned char BYTE; typedef unsigned short WORD; typedef unsigned long DWORD; 也就是说BYTE是无...
  • BYTEWORD,DWORD

    千次阅读 2010-05-01 10:31:00
    最近在看LPC1766的KEIL例程,里面变量类型都是BYTEWORD,DWORD,并不是常见的char,int等,查type.h,看到它们的定义如下: typedef unsigned char BYTE;typedef unsigned short WORD;typedef unsigned long ...
  • byte、half-wordword的区别

    千次阅读 2012-12-16 22:50:27
    向ARM看齐了,理解一下32位ARM和8/16位MCU 对于byte、half-wordword的区别 /***************************************************** 对字(Word)、半字(Half-Word)、字节(Byte)的概念说明如下: 字...
  • C++中BYTEWORD、DWORD的作用以及区别

    千次阅读 2018-11-15 11:53:26
    在VC++6.0中,BYTEWORD、DWORD实际上是一种无符号整形,在WINDEF.h中被定义 typedef unsigned char BYTE; typedef unsigned short WORD; typedef unsigned long DWORD; 也就是说BYTE是无符号char类型,WORD是...
  • C++中BYTEWORD、DWORD

    2020-05-13 10:47:53
    在VC++6.0中,char的1字节,short是2字节,int和long都是4字节,因此可以认为BYTEWORD、DWORD定义的变量分别是1节,2字节,4字节。 即:BYTE = unsigned char,WORD = unsigned short,DWORD = unsigned long ...
  • 类型BYTE,WORD与DWORD

    千次阅读 2012-08-07 10:05:53
    做程序最烦人的就是碰到,程序没什么语法错误,编译通过,运行也通过,就是不出...为了不让其他同行也犯类似的低级错误,现将BYTE、DWORD和WORD类型的区别列在下边,仅供参考。^_^ 在Visual C++ 6.0中,BYTEWORD,D
  •  DWORD WORD BYTE 相互转换

    万次阅读 2012-05-08 17:19:14
    DWORD WORD BYTE 相互转换    DWORD 4个字节  WORD 2个字节  BYTE 1个字节   1) DWORD--->WORD DWORD dw=0; WORD hW=HIWORD(dw); WORD lW=LOWORD(lw); 2)WORD--->DWORD DWORD ...

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