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ACE24C1024DP+UH 参数 Datasheet PDF下载

ACE24C1024DP+UH图片预览
型号: ACE24C1024DP+UH
PDF下载: 下载PDF文件 查看货源
内容描述: 两线串行EEPROM [Two-wire Serial EEPROM]
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: 16 页 / 655 K
品牌: ACE [ ACE TECHNOLOGY CO., LTD. ]
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ACE24C1024  
Two-wire Serial EEPROM  
Write Operations  
Byte Write:  
A write operation requires two 8-bit data word address following the device address word and  
acknowledgment. Upon receipt of this address, the EEPROM will again respond with a zero and then  
clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a  
zero and the addressing device, such as a microcontroller, must terminate the write sequence with a  
stop condition. At this time the EEPROM enters an internally timed write cycle, tWR, to the nonvolatile  
memory. All inputs are disabled during this write cycle and the EEPROM will not respond until the write  
is complete (refer to Figure 8).  
Page Write:  
The 1024K EEPROM is capable of an 256-byte page write.  
A page write is initiated the same as a byte write, but the microcontroller does not send a stop  
condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the  
first data word, the microcontroller can transmit up to 255 more data words. The EEPROM will respond  
with a zero after each data word received. The microcontroller must terminate the page write sequence  
with a stop condition (refer to Figure 9).  
The data word address lower 8 bits are internally incremented following the receipt of each data word.  
The higher data word address bits are not incremented, retaining the memory page row location. When  
the word address, internally generated, reaches the page boundary, the following byte is placed at the  
beginning of the same page. If more than 256 data words are transmitted to the EEPROM, the data  
word address will “roll over” and previous data will be overwritten.  
Acknowledge Polling:  
Once the internally timed write cycle has started and the EEPROM inputs are disabled, acknowledge  
polling can be initiated. This involves sending a start condition followed by the device address word.  
The read/write bit is representative of the operation desired. Only if the internal write cycle has  
completed will the EEPROM respond with a zero allowing the read or write sequence to continue.  
Read Operations  
Read operations are initiated the same way as write operations with the exception that the read/write  
select bit in the device address word is set to one. There are three read operations: current address  
read, random address read and sequential read.  
Current Address Read:  
The internal data word address counter maintains the last address accessed during the last read or  
write operation, incremented by one. This address stays valid between operations as long as the chip  
power is maintained. The address “roll over” during read is from the last byte of the last memory page  
to the first byte of the first page. The address “roll over” during write is from the last byte of the current  
page to the first byte of the same page.  
Once the device address with the read/write select bit set to one is clocked in and acknowledged by  
the EEPROM, the current address data word is serially clocked out. The microcontroller does not  
respond with an input zero but does generate a following stop condition (refer to Figure 10).  
VER 1.4  
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