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| 型號(hào)： | MFRC53101T |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | ISO-IEC 14443 reader IC |
| 封裝： | MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 51, 2004,;MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html< |
| 文件頁(yè)數(shù)： | 16/116頁(yè) |
| 文件大?。?/td> | 862K |
| 代理商： | MFRC53101T |
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MFRC531_34
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.4 — 26 January 2010
056634
16 of 116
NXP Semiconductors
MFRC531
ISO/IEC 14443 reader IC
9.2.2.3
Register initialization file (read/write)
The EEPROM memory content from block address 3 to 7 can initialize register sub
addresses 10h to 2Fh when the LoadConfig command is executed (see
Section 11.4.1 on
page 86
). This command requires the EEPROM starting byte address as a two byte
argument for the initialization procedure.
The byte assignment is shown in
Table 16
.
Table 16.
EEPROM byte address
EEPROM starting byte address
EEPROM + 1 starting byte address
...
EEPROM + 31 starting byte address
The register initialization file is large enough to hold values for two initialization sets and
up to one block (16-byte) of user data.
Remark:
The register initialization file can be read/written by users and these bytes can
be used to store other user data.
After each power-up, the default configuration enables the MIFARE and ISO/IEC 14443 A
protocol.
9.2.3
Crypto1 keys (write only)
MIFARE security requires specific cryptographic keys to encrypt data stream
communication on the contactless interface. These keys are called Crypto1 keys.
9.2.3.1
Key format
Keys stored in the EEPROM are written in a specific format. Each key byte must be split
into lower four bits k0 to k3 (lower nibble) and the higher four bits k4 to k7 (higher nibble).
Each nibble is stored twice in one byte and one of the two nibbles is bit-wise inverted. This
format is a precondition for successful execution of the LoadKeyE2 (see
Section 11.6.1 on
page 88
) and LoadKey commands (see
Section 11.6.2 on page 88
).
Using this format, 12 bytes of EEPROM memory are needed to store a 6-byte key. This is
shown in
Figure 7
.
Example
: The value for the key must be written to the EEPROM.
If the key was: A0h A1h A2h A3h A4h A5h then:
5Ah F0h 5Ah E1h 5Ah D2h 5Ah C3h 5Ah B4h 5Ah A5h would be written.
Byte assignment for register initialization at startup
Register address
10h
11h
…
2Fh
Remark
skipped
copied
…
copied
Fig 7.
Key storage format
001aak640
0 (LSB)
Master key byte
Master key bits
EEPROM byte
address
Example
k7 k6 k5 k4 k7 k6 k5 k4
n
5Ah
k3 k2 k1 k0 k3 k2 k1 k0
n + 1
F0h
1
k7 k6 k5 k4 k7 k6 k5 k4
n + 2
5Ah
k3 k2 k1 k0 k3 k2 k1 k0
n + 3
E1h
5 (MSB)
k7 k6 k5 k4 k7 k6 k5 k4
n + 10
5Ah
k3 k2 k1 k0 k3 k2 k1 k0
n + 11
A5h
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