AT88SC6416CRF-MR1 查看數據表（PDF） - Atmel Corporation

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AT88SC6416CRF-MR1

CryptoRF® Specification

Atmel Corporation 

H.3.

Device Configuration Options

There are a few configuration options which affect the overall behavior of the CryptoRF PICC. These options are

contained in the Device Configuration Register (DCR).

H.3.1. Device Configuration Register (DCR)

There is one Device Configuration Register in each PICC. The default state of this register is $FF for 88SC PICCs and

$7C for 88RF PICCs.

Figure 28. Definition of the Device Configuration Register for 88SC PICCs.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

SME UCR UAT ETA EGTL RFU RFU RFU

1

1

1

1

1

1

1

1 Default Value

Figure 29. Definition of the Device Configuration Register for 88RF PICCs.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

SME RFU UAT RFU EGTL RFU WCS RCS

0

1

1

1

1

1

0

0

Default Value

The DCR register definition is shown in Figure 28 and Figure 29. Bits 0, 1, and 2 are reserved for future use. Changes

to the DCR are effective at the next Power On or anticollision sequence.

SME:

Supervisor Mode Enable control.

By default the Supervisor Mode is disabled on 88SC PICCs and enabled on 88RF PICCs. If SME = 0b then Supervisor

Mode is enabled and Password Write 7 becomes the Supervisor Password. Successful verification of the Supervisor

Password grants read and write access to all passwords and Password Attempt Counters (PACs), allowing the

passwords to be changed and PACs to be reset.

UCR:

Unlimited Checksum Read control. [88SC]

By default the UCR is disabled. If UCR = 0b then Unlimited Checksum Reads are enabled. This function is intended for

development use only, since it allows systematic attacks on the security. This function does not affect the Password

Attempts Counters (PACs).

UAT:

Unlimited Authentication Trials control.

By default the UAT is disabled. If UAT = 0b then the Authentication Attempts Counters (AACs) are disabled for all key

sets. This function is intended for development use only, since it allows systematic attacks on the security. This

function does not affect the Password Attempts Counters (PACs).

ETA:

Extended Trials Allowed control. [88SC]

By default the Extended Trials Allowed option is disabled. If this option is enabled by setting ETA = 0b then the

maximum number of authentication and password trials is increased to permit a maximum of eight attempts before a

password or key is locked. If ETA is disabled then only four attempts are permitted.

EGTL:

Extra Guard Time Length control.

By default the Extra Guard Time Length option is disabled, which maximizes RF communication speed. This option

controls the Extra Guard Time (EGT) for all data transmitted by the PICC. The default setting of EGTL = 0b selects

zero ETUs of EGT. Setting EGTL = 1b selects two ETUs of EGT for all transmissions. The EGTL option does not affect

EGT requirements for data transmitted by the reader. See Appendix O for information about EGT.

WCS:

Write Checksum Timeout control. [88RF]

By default the WCS is enabled. In authentication and encryption communication security modes the correct checksum

must be provided within 77 mS or the write operation is aborted. Setting WCS = 1b disables the timeout function.

RCS:

Read Checksum control. [88RF]

By default the RCS is enabled, which allows one Read Checksum operation without resetting the cryptographic engine.

100 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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