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11AA011-ISN 参数 Datasheet PDF下载

11AA011-ISN图片预览
型号: 11AA011-ISN
PDF下载: 下载PDF文件 查看货源
内容描述: 1K - 16K UNI / O ?串行EEPROM系列数据手册 [1K-16K UNI/O® Serial EEPROM Family Data Sheet]
分类和应用: 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
文件页数/大小: 44 页 / 801 K
品牌: MICROCHIP [ MICROCHIP ]
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11AAXXX/11LCXXX  
Upon receipt of each word, the four lower-order  
Address Pointer bits are internally incremented by one.  
The higher-order bits of the word address remain con-  
stant. If the master should transmit data past the end of  
the page, the address counter will roll over to the begin-  
ning of the page, where further received data will be  
written.  
4.3  
Write Instruction  
Prior to any attempt to write data to the 11XX, the write  
enable latch must be set by issuing the WREN  
instruction (see Section 4.4).  
Once the write enable latch is set, the user may pro-  
ceed with issuing a WRITE instruction (including the  
header and device address bytes) followed by the MSB  
and LSB of the Word Address. Once the last Acknowl-  
edge sequence has been performed, the master  
transmits the data byte to be written.  
Note: Page write operations are limited to writ-  
ing bytes within a single physical page,  
regardless of the number of bytes actu-  
ally being written. Physical page bound-  
aries start at addresses that are integer  
multiples of the page size (16 bytes) and  
end at addresses that are integer multi-  
ples of the page size minus 1. As an  
example, the page that begins at  
address 0x30 ends at address 0x3F. If a  
page Write command attempts to write  
across a physical page boundary, the  
result is that the data wraps around to  
the beginning of the current page (over-  
writing data previously stored there),  
instead of being written to the next page  
as might be expected. It is therefore  
necessary for the application software to  
prevent page write operations that  
would attempt to cross a page bound-  
ary.  
The 11XX features a 16-byte page buffer, meaning that  
up to 16 bytes can be written at one time. To utilize this  
feature, the master can transmit up to 16 data bytes to  
the 11XX, which are temporarily stored in the page buf-  
fer. After each data byte, the master sends a MAK, indi-  
cating whether or not another data byte is to follow. A  
NoMAK indicates that no more data is to follow, and as  
such will initiate the internal write cycle.  
Note: If a NoMAK is generated before any data  
has been provided, or if a standby pulse  
occurs before the NoMAK is generated,  
the 11XX will be reset, and the write  
cycle will not be initiated.  
FIGURE 4-3:  
WRITE COMMAND SEQUENCE  
Device Address  
Standby Pulse  
Start Header  
SCIO  
0 1 0 1 0 1 0 1  
1 0 1 0 0 0 0 0(1)  
Word Address LSB  
Command  
Word Address MSB  
7 6 5 4 3 2 1 0  
15 14 13 12 11 10 9 8  
SCIO  
0 1 1 0 1 1 0 0  
Data Byte n  
Data Byte 2  
Data Byte 1  
7 6 5 4 3 2 1 0  
SCIO  
7 6 5 4 3 2 1 0  
7 6 5 4 3 2 1 0  
Twc  
Note 1: For the 11XXXX1, this bit must be a ‘1’.  
DS22067H-page 12  
Preliminary  
2010 Microchip Technology Inc.  
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