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參數(shù)資料
| 型號： | 24LC024TSN |
| 英文描述： | I2C Serial EEPROM |
| 中文描述： | I2C串行EEPROM的 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 182K |
| 代理商： | 24LC024TSN |
24LC024/24LC025
1999 Microchip Technology Inc.
DS21210D-page 9
8.0
READ OPERATIONS
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
slave address is set to one. There are three basic types
of read operations: current address read, random read,
and sequential read.
8.1
Current Address Read
The 24LC024/24LC025 contains an address counter
that maintains the address of the last word accessed,
internally incremented by one. Therefore, if the previ-
ous read access was to address n, the next current
address read operation would access data from
address n + 1. Upon receipt of the slave address with
the R/W bit set to one, the 24LC024/24LC025 issues
an acknowledge and transmits the eight bit data word.
The master will not acknowledge the transfer but does
generate a stop condition and the 24LC024/24LC025
discontinues transmission (Figure 8-1).
8.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
24LC024/24LC025 as part of a write operation. After
the word address is sent, the master generates a start
condition following the acknowledge. This terminates
the write operation, but not before the internal address
pointer is set. Then the master issues the control byte
again but with the R/W bit set to a one. The 24LC024/
24LC025 will then issue an acknowledge and transmits
the eight bit data word. The master will not acknowl-
edge the transfer but does generate a stop condition
and the 24LC024/24LC025 discontinues transmission
(Figure 8-2). After this command, the internal address
counter will point to the address location following the
one that was just read.
8.3
Sequential Read
Sequential reads are initiated in the same way as a ran-
dom read except that after the 24LC024/24LC025
transmits the first data byte, the master issues an
acknowledge as opposed to a stop condition in a ran-
dom read. This directs the 24LC024/24LC025 to trans-
mit the next sequentially addressed 8-bit word
(Figure 8-3).
To provide sequential reads the 24LC024/24LC025
contains an internal address pointer which is incre-
mented by one at the completion of each operation.
This address pointer allows the entire memory con-
tents to be serially read during one operation. The inter-
nal address pointer will automatically roll over from
address 0FFh to address 000h.
FIGURE 8-1:
CURRENT ADDRESS READ
FIGURE 8-2:
RANDOM READ
FIGURE 8-3:
SEQUENTIAL READ
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
P
S
S
T
O
P
CONTROL
BYTE
S
T
A
R
T
DATA
A
C
K
N
O
A
C
K
S
P
S
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
S
T
O
P
CONTROL
BYTE
A
C
K
WORD
ADDRESS (n)
CONTROL
BYTE
S
T
A
R
T
DATA (n)
A
C
K
A
C
K
N
O
C
K
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
CONTROL
BYTE
DATA n
DATA n + 1
DATA n + 2
DATA n + X
N
O
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
S
T
O
P
P
This Material Copyrighted by Its Respective Manufacturer
相關PDF資料 |
PDF描述 |
|---|---|
| 24LC024TST | DS3/E3 Multiplexer Reference Design |
| 24LC025IP | I2C Serial EEPROM |
| 24LC025ISN | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 24LC025IST | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 24LC025P | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 24LC024TST | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| 24LC025 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2K I2C? Serial EEPROM |
| 24LC025/P | 功能描述:電可擦除可編程只讀存儲器 256x8 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LC025/SN | 功能描述:電可擦除可編程只讀存儲器 256x8 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LC025/ST | 功能描述:電可擦除可編程只讀存儲器 256x8 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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