; This collection of routines allows an AT89C2051 microcontroller to read
; and write the AT24Cxx family of serial CMOS EEPROMS. This version of the
; code is compatible only with the AT89C2051 due to the location of the
; data buffer and stack in RAM. The code may be modified to work with the
; AT89C1051 by relocating or resizing the buffer and stack to fit into the
; smaller amount of RAM available in the AT89C1051. Note that the minimum
; size of the buffer is determined by the page size of the AT24Cxx.
该程序集允许AT89C2051读写AT24Cxx系列串行CMOS EEPROM.
此版本代码仅仅适用于AT89C2051的内存的数据缓冲和堆栈。
此代码经改进可以用于AT89C1051,改变缓冲和堆栈值，以适应AT89C1051内部较小的可用内存
注，最小缓冲值由AT24Cxx页尺寸决定。
; All five AT24Cxx device operations are supported. Byte Write, Current
; Address Read and Random Read are implemented by the functions WRITE_BYTE,
; READ_CURRENT and READ_RANDOM, respectively. Page Write and Sequential Read
; are special cases of functions WRITE_BLOCK and READ_BLOCK, respectively.
; WRITE_BLOCK and READ_BLOCK process from one byte to the number of bytes
; in a page and transfer data between the AT24Cxx and the RAM buffer.
AT24Cxx全部五种设备操作均被支持。字节写(Byte Write)、当前地址读(Current Address Read)和随机读(Random Read)
分别由WRITE_BYTE、READ_CURRENT和READ_RANDOM函数实现。
页写(Page Write)和连续读(Sequential Read)分别是函数WRITE_BLOCK和READ_BLOCK的特例。
WRITE_BLOCK和READ_BLOCK处理一个字节到一页的字节数，并在AT24Cxx和内存缓冲间传送数据。
; The code supports multiple AT24Cxx devices per bus, each with a unique
; address determined by the wiring of the address pins (A0, A1, A2). The
; three-bit programmable address is passed to the WRITE_BYTE, READ_CURRENT,
; READ_RANDOM, WRITE_BLOCK and READ_BLOCK functions, where it is combined
; with the AT24Cxx fixed address (FADDR) and used to address a device on the
; bus. Refer to the AT24Cxx family data sheets for additional information on
; device addressing.
代码支持一条总线上的多个AT24Cxx，每个设备的唯一地址由地址脚(A0,A1,A2)的连线决
定。三位编程地址被传送到WRITE_BYTE,READ_CURRENT,READ_RANDOM,WRITE_BLOCK和
READ_BLOCK函数中，与AT24Cxx固定地址(FADDR)组合，确定总线上的设备地址。
设备选址的附加信息查阅AT24Cxx系列内存的数据表。
; Functions BYTE_FILL, VERIFY_BYTE_FILL, PAGE_FILL and VERIFY_PAGE_FILL are
; artifacts from the debug process and serve to illustrate the use of the
; device read and write functions with an AT24C64. To modify the code for a
; different member of the AT24Cxx family, simply redefine the values of SIZE
; (the number of bytes per device) and PSIZE (the number of bytes per page).
; To change the fill value, redefine FILL. To change the programmable portion
; of the device address, redefine PADDR to a value from zero to seven.
函数BYTE_FILL,VERIFY_BYTE_FILL,PAGE_FILL和VERIFY_PAGE_FILL从调试处理和服务到
设备读写功能的使用是以AT24C64为例的。
可修改代码用于AT24Cxx系列的其他型号，简单地重新定义下SIZE的值(内存的总
字节数)和PSIZE的值(每页的字节数)。改变要填充的值，重新定义FILL。改变设备地址
的编程部分，重新设置为一个0到7之间的数值。
; The code meets all AT24Cxx family timing requirements when executed by an
; AT89Cx051 microcontroller with a 12 MHz clock. Code modifications may be
; required if a faster clock is substituted.
在AT89Cx051处理器采用12MHz的时钟时，代码能满足所有AT24Cxx系列内存的时序要求。
处理器运行在更高时钟时，代码需要修改。
以上就是本人的译文,好些地方没有搞明白,有英文高手的话,指点1下.谢谢.
本人一直认为,读懂注释,对理解程序有很大的帮助,我努力想搞明白这些英文的意思.
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