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AT24C64B
13. 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 13-4 on
page 12).
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 13-5 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 13-6 on page 12).
Figure 13-1. Device Address
9
3350E–SEEPR–9/07
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相关代理商/技术参数
AT24C64B-10TU-2.7 功能描述:电可擦除可编程只读存储器 10MS IND TEMP 2.7V RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
AT24C64B-10TU-2.7 SL383 制造商:Atmel Corporation 功能描述:EEPROM Serial-2Wire 64K-Bit 8K x 8 3.3V/5V 8-Pin TSSOP T/R 制造商:Atmel Corporation 功能描述:EEPROM SERL-2WIRE 64KBIT 8KX8 3.3V/5V 8TSSOP - Tape and Reel
AT24C64BN-10SI-2.7 制造商:Atmel Corporation 功能描述:
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AT24C64BN-10SU-2.7 SL383 制造商:Atmel Corporation 功能描述:EEPROM Serial-2Wire 64K-Bit 8K x 8 3.3V/5V 8-Pin SOIC T/R 制造商:Atmel Corporation 功能描述:EEPROM SERL-2WIRE 64KBIT 8KX8 3.3V/5V 8SOIC - Tape and Reel
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