收藏本站
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 “1”. 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 “1” 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 “0” but does generate a following stop condition, see Figure 8-1 .
Figure 8-1.
Current Address Read
S
T
A
R
T
DEVICE
ADDRESS
R
E
A
D
S
T
O
P
SDA LINE
M
S
B
R A
/ C
W K
DATA
N
O
A
C
K
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 “0” but does generate a following
stop condition, see Figure 8-2 .
Figure 8-2.
Random Read
S
T
A
R
T
DEVICE
ADDRESS
W
R
I
T
E
WORD
ADDRESS n
S
T
A
R
T
DEVICE
ADDRESS
R
E
A
D
S
T
O
P
SDA LINE
M
S
B
R A M
/ C S
W K B
A
C
K
M
S
B
A
C
K
DATA n
N
O
A
C
K
DUMMY WRITE
10
AT24HC02B
5134E–SEEPR–3/08
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
AT25040A-10TU-1.8 IC EEPROM 4KBIT 20MHZ 8TSSOP
AT25040N-10SI-2.7 IC EEPROM 4KBIT 2.1MHZ 8SOIC
AT25128AW-10SU-2.7 IC EEPROM 128KBIT 20MHZ 8SOIC
AT25160B-XHL-T IC EEPROM 16KBIT 20MHZ 8TSSOP
AT25256B-SSHL-B IC EEPROM 256KBIT 20MHZ 8SOIC
AT25256T2-10TI-2.7 IC EEPROM 256KBIT 3MHZ 20TSSOP
AT25320AY6-10YH-1.8 IC EEPROM 32KBIT 20MHZ 8DFN
AT25640T1-10TI-2.7 IC EEPROM 64KBIT 3MHZ 14TSSOP
相关代理商/技术参数
AT24HC02B-TH-T 功能描述:电可擦除可编程只读存储器 1.8V - 1.8V 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
AT24HC02C-PUM 制造商:Atmel Corporation 功能描述:SERIAL EEPROM, 2K (256 X 8), 2-WIRE - 8 PDIP, PB/HALO FREE, - Rail/Tube 制造商:Atmel Corporation 功能描述:Atmel AT24HC02C-PUM EEPROM 制造商:Atmel Corporation 功能描述:IC EEPROM 2KBIT 1MHZ 8DIP
AT24HC02C-SSHM-B 制造商:Atmel Corporation 功能描述:SERIAL EEPROM, 2K (256 X 8), 2-WIRE - 8 SOIC, PB/HALO FREE, - Bulk 制造商:Atmel 功能描述:SERIAL EE 制造商:Atmel Corporation 功能描述:IC EEPROM 2KBIT 8SOIC 1.7V 制造商:Atmel Corporation 功能描述:2K 2-WIRE 8 SOIC PB HALOFREE NiPdAu 1.7V 制造商:Atmel 功能描述:EEPROM Serial-I2C 2K-bit 256 x 8 1.8V/2.5V/3.3V 8-Pin SOIC Bulk
AT24HC02C-SSHM-T 制造商:Atmel Corporation 功能描述:SERIAL EEPROM, 2K (256 X 8), 2-WIRE - 8 SOIC, PB/HALO FREE, - Tape and Reel 制造商:Atmel 功能描述:Atmel AT24HC02C-SSHM-T EEPROM 制造商:Atmel Corporation 功能描述:IC EEPROM 2KBIT 8SOIC 1.7V 制造商:Atmel Corporation 功能描述:2K 2-WIRE 8 SOIC PB HALOFREE NiPdAu 1.7V
AT24HC02C-XHM-B 制造商:Atmel Corporation 功能描述:SERIAL EEPROM, 2K (256 X 8), 2-WIRE - 8 TSSOP, PB/HALO FREE, - Bulk 制造商:Atmel Corporation 功能描述:EEPROM Serial-I2C 2K-bit 256 x 8 1.8V/2.5V/3.3V 8-Pin SOIC Bulk 制造商:Atmel Corporation 功能描述:IC EEPROM 2KBIT 1MHZ 8TSSOP
AT24HC02C-XHM-T 制造商:Atmel Corporation 功能描述:SERIAL EEPROM, 2K (256 X 8), 2-WIRE - 8 TSSOP, PB/HALO FREE, - Tape and Reel 制造商:Atmel Corporation 功能描述:IC EEPROM 2KBIT 1MHZ 8TSSOP
AT24HC04BN-SH-B 功能描述:电可擦除可编程只读存储器 4K - 512 x 8 1.8V to 5.5V supply 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
AT24HC04BN-SH-T 功能描述:电可擦除可编程只读存储器 4K - 512 x 9 1.8V to 5.5V supply 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