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AT24C02C-W-11M 参数 Datasheet PDF下载

AT24C02C-W-11M图片预览
型号: AT24C02C-W-11M
PDF下载: 下载PDF文件 查看货源
内容描述: [EEPROM, 256X8, Serial]
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时钟内存集成电路
文件页数/大小: 27 页 / 937 K
品牌: MICROCHIP [ MICROCHIP ]
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8. 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 (see Figure 8-4 on  
page 11).  
RANDOM READ: A random read requires a dummy” byte write sequence to load in the data  
word address. Once the device address word and data word address are clocked in and  
acknowledged by the EEPROM, the microcontroller must generate another start condition. The  
microcontroller now initiates a current address read by sending a device address with the  
read/write select bit high. The EEPROM acknowledges the device address and serially clocks  
out the data word. The microcontroller does not respond with a zero but does generate a follow-  
ing stop condition (see Figure 8-5 on page 12).  
SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a ran-  
dom address read. After the microcontroller receives a data word, it responds with an  
acknowledge. As long as the EEPROM receives an acknowledge, it will continue to increment  
the data word address and serially clock out sequential data words. When the memory address  
limit is reached, the data word address will “roll over” and the sequential read will continue. The  
sequential read operation is terminated when the microcontroller does not respond with a zero  
but does generate a following stop condition (see Figure 8-6 on page 12).  
Figure 8-1. Device Address  
MSB  
LSB  
10  
AT24C02C [Preliminary]  
8700CSEEPR–6/10