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參數(shù)資料
| 型號： | AT88SC0404CRF |
| 英文描述： | AT88SC0404CRF Summary [Updated 05/03. 9 Pages] Contactless 4-Kbit user memory with authentication and encryption. ISO/IEC 14443 Type B compliant. This is a summary document. A complete is available under NDA. For more information. please contact your local Atmel sales office. |
| 中文描述： | AT88SC0404CRF摘要[更新05/03。 9頁]接觸4千位的身份驗(yàn)證和加密用戶內(nèi)存。的ISO / IEC 14443 B類標(biāo)準(zhǔn)。這是一個總結(jié)文件。一個完整的保密協(xié)議下提供。欲了解更多信息。請聯(lián)系您當(dāng)?shù)貝厶孛窢栦N售辦事處。 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大小： | 141K |
| 代理商： | AT88SC0404CRF |
6
AT88SC0104C
2021BS–SMEM–10/02
Communication
Security Modes
Communications between the device and host operate in three basic modes. Standard
mode is the default mode for the device after power-up. Authentication mode is acti-
vated by a successful authentication sequence. Encryption mode is activated by a
successful encryption activation following a successful authentication.
Note:
1. Configuration data include viewable areas of the Configuration Zone except the passwords:
MDC: Modification Detection Code.
MAC: Message Authentication Code.
Security Options
Anti-tearing
In the event of a power loss during a write cycle, the integrity of the device’s stored data
may be recovered. This function is optional: the host may choose to activate the anti-
tearing function, depending on application requirements. When anti-tearing is active,
write commands take longer to execute, since more write cycles are required to com-
plete them, and data are limited to eight bytes.
Data are written first to a buffer zone in EEPROM instead of the intended destination
address, but with the same access conditions. The data are then written in the required
location. If this second write cycle is interrupted due to a power loss, the device will
automatically recover the data from the system buffer zone at the next power-up.
In two-wire mode, the host is required to perform ACK polling for up to 20 ms after write
commands when anti-tearing is active. At power-up, the host is required to perform ACK
polling, in some cases for up to 10 ms, in the event that the device needs to carry out the
data recovery process.
Write Lock
If a user zone is configured in the write lock mode, the lowest address byte of an 8-byte
page constitutes a write access byte for the bytes of that page.
Example
: The write lock byte at $080 controls the bytes from $080 to $087.
The write lock byte may also be locked by writing its least significant (rightmost) bit to
“0”. Moreover, when write lock mode is activated, the write lock byte can only be pro-
grammed — that is, bits written to “0” cannot return to “1”.
In the write lock configuration, only one byte can be written at a time. Even if several
bytes are received, only the first byte will be taken into account by the device.
Table 4.
Communication Security Modes
(1)
Mode
Configuration Data
User Data
Passwords
Data Integrity Check
Standard
Clear
Clear
Clear
MDC
(1)
Authentication
Clear
Clear
Encrypted
MAC
(1)
Encryption
Clear
Encrypted
Encrypted
MAC
(1)
$080
$081
$082
$083
$084
$085
$086
$087
@
11011001
xxxx xxxx
locked
xxxx xxxx
locked
xxxx xxxx
xxxx xxxx
xxxx xxxx
locked
xxxx xxxx
xxxx xxxx
$80
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT88SC0404C-SC-XX | EEPROM |
| AT88SC0404C-SC-XX-2.7 | EEPROM |
| AT88SC0808C-09CT-XX | EEPROM |
| AT88SC0808C-09CT-XX-2.7 | EEPROM |
| AT88SC0808C-09DT-XX | EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT88SC0404CRF-MR1 | 功能描述:電可擦除可編程只讀存儲器 CRYPTORF 4K, 82pF 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| AT88SC0404CRF-MX1 | 功能描述:電可擦除可編程只讀存儲器 CRYPTORF 4K, 13mm 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| AT88SC0404CRF-MY1 | 功能描述:電可擦除可編程只讀存儲器 CRF 4Kbit 4zone Green 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| AT88SC0404CRF-WA1 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:13.56 MHz CryptoRF EEPROM Memory 4 Kbits |
| AT88SC0404C-SC-XX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EEPROM |
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