參數(shù)資料
型號(hào)： AT24RF08C
廠商： Atmel Corp.
英文描述： Asset Identification EEPROM(雙存取EEPROM（帶一個(gè)有線串行端口和一個(gè)無線RFID端口）)
中文描述： 資產(chǎn)識(shí)別的EEPROM（雙存取的EEPROM（帶一個(gè)有線串行端口和一個(gè)無線RFID的端口））
文件頁(yè)數(shù)： 3/21頁(yè)
文件大?。?/td> 429K
代理商： AT24RF08C
AT24RF08C
3
Access Protection
All access protection bits are stored on a separate page of
the EEPROM that is not accessed using the normal
commands of an AT24C08 memory. See the
“
Access
Protection Page
”
section on page 5, for more detail on this
information.
The RFID Access (RF) fields in the Access Protection Page
determines whether or not the corresponding block within
the memory can be read or written via the RFID interface. If
an illegal command is attempted, the command will be
aborted. The MSB, if clear, prohibits all accesses from the
RFID port, and the LSB if clear prohibits writes from the
RFID port. The fields are stored in the EEPROM and
organized as follows:
The Protection Bits (PB) fields in the Access Protection
Page determine what type of accesses will be permitted via
the serial port for each of the blocks on the chip. If an illegal
access is attempted, the command will be NACK
’
ed. The
MSB, if clear, prohibits all accesses to the block, and the
LSB if clear prohibits writes. The fields are stored in the
EEPROM and are organized as follows:
The Tamper Write (TW) bits within the access protection
page control whether or not a write will be permitted into
the corresponding block of memory when the Tamper Bit is
set. If the Tamper Bit is a 1 and the TW bit is a 0, then
writes to that block from the RFID port are not permitted. In
all other cases, writes are permitted according to the RF
field value for that block. The value of this bit does not affect
accesses from the serial port.
Accessed within the Access Protection Page is an
individual CMOS Sticky Bit (SB) for each of the 8 blocks on
the device. When the value of the sticky bit is 0, the
Protection Bits (PB) for the corresponding block may not be
changed via the software. These bits are all set to one
when power is initially applied or when the PROT pin is low.
These sticky bits may be written only to a 0
via the serial
interface using the standard serial write operations.
Reading the sticky bits does not affect their state.
Because access permissions are set individually for each
of the blocks, all reads via the serial port will only read
bytes within the block that was specified when the current
address was latched into the device (with a write
command). The block address bits (B
2
or B
1
) that are sent
with the write command are ignored on a read command.
After the read of the last byte within a block, the internal
serial address wraps around to point at the beginning of
that block. After the write of the last byte in a page, the
internal address is wrapped around to point to the
beginning of that page. If more than 16 bytes are sent to
the device with a write command, the data written to any
overlapping bytes will be corrupted.
If the WP pin is high, all write operations are prohibited
from the serial port, although write commands may be used
to set the address for a subsequent read command.
Block 0 Write Protection Bits
The AT24RF08C provides a mechanism to divide block 0
into eight 128-bit (16 byte) pages that can be individually
protected against writes from either port. These eight write
protection (WP) bits are stored within a byte of the access
protection page and are organized such that the LSB
protects the first 128 bits and so on. If a bit in this byte is set
to a one and the PB
0
field is set to 11, then writes are
permitted on the page corresponding to the WP bit. If the
WP bit is set to a 0 or the PB
0
is any value other than 11,
then writes are not permitted in that page.
The Write Protection hierarchy for serial accesses is shown
on the following page. In this drawing the bits within the
boxes to the left of the arrows are the only thing that
determine whether or not the bit in the box to the right of
the arrow can be written. Read access control is not shown
in this diagram. Addresses listed in this diagram are for the
serial port assuming that the R/W bit in the command byte
is set to 0.
RFID Access Fields (RF)
MSB
LSB
Function
0
0
No accesses permitted from RFID port
0
1
No accesses permitted from RFID port
1
0
Reads only from the RFID port
1
1
No restrictions for RFID accesses
Protection Bits (PB)
MSB
LSB
Function
0
0
No accesses permitted in the block
0
1
No accesses permitted in the block
1
0
Read only, writes cause a NACK
1
1
Read/write - No access constraints for
data within this block
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT24RF08CN-105C 功能描述:IC EEPROM 8KBIT 100KHZ 8SOIC 制造商:microchip technology 系列:- 包裝:管件 零件狀態(tài):停產(chǎn) 存儲(chǔ)器類型:非易失 存儲(chǔ)器格式:EEPROM 技術(shù):EEPROM 存儲(chǔ)容量:8Kb （1K x 8） 時(shí)鐘頻率:100kHz 寫周期時(shí)間 - 字，頁(yè):10ms 訪問時(shí)間:450ns 存儲(chǔ)器接口:I2C 電壓 - 電源:2.4 V ~ 5.5 V 工作溫度:-40°C ~ 85°C（TJ） 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SOIC 基本零件編號(hào):AT24RF08 標(biāo)準(zhǔn)包裝:1
AT24RF08CN-10SC 功能描述:電可擦除可編程只讀存儲(chǔ)器 RFID 8k RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
AT24RF08CN10SC-C0006 制造商:Atmel Corporation 功能描述:EEPROM
AT24RF08CT-10T1C 制造商:Atmel Corporation 功能描述:1K X 8 I2C/2-WIRE SERIAL EEPROM, PDSO14
AT24RF08-EK 功能描述:KIT EVAL FOR AT24RF08CN-10SC RoHS:否 類別:RF/IF 和 RFID >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:用于 200/300 系列的歐盟開發(fā)套件 適用于相關(guān)產(chǎn)品:Zensys RF 模塊 所含物品:開發(fā)板，模塊，編程器，軟件，線纜，電源 其它名稱:703-1019Q3225667
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