AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

6.17. DESELECT Command [$cA]

The DESELECT command places a PICC in the Halt State. This command is used at the end of a transaction.

Reader

PICC

Command >

CID

$A

CRC1

CRC2

Echo Command >

CID

$A

ACK

STATUS

CRC1

CRC2

6.17.1. Operation

Sending the DESELECT command (with a matching CID) to a PICC in the Active State places the PICC in the Halt

State. The User Zone, password, and authentication registers are cleared before the PICC enters the Halt State. Only

PICCs in the Active State are permitted to answer this command.

6.17.2. Command Field Descriptions

CID:

The Card ID assigned by the ATTRIB command.

CRC:

Communication error detection bytes.

6.17.3. Response Field Descriptions

CID:

The PICC transmits its assigned card ID in the response.

ACK:

Acknowledge, the command executed correctly.

STATUS: PICC status code.

CRC:

Communication error detection bytes.

6.17.4. Error Handling

If a DESELECT command containing transmission errors is received by the PICC, it is ignored and no response is

sent. The PICC reports errors in the status byte of the response.

Table 51.

No errors

Status Codes returned in the DESELECT response

Error/Status Message

Status Code

$00

Type

ACK

6.17.5. Notes

The HLTB command is identical for 88SC and 88RF CryptoRF PICCs.

61

5276C–RFID–3/09

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