AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT88RF04C-MY1G Datasheet PDF : 158 Pages
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AT88SC0808/1616/3216/6416CRF, AT88RF04C
6.16.
Send Checksum Command [$c9]
The Send Checksum command is used to authenticate data sent to the PICC in the Authentication Communication
Security mode or the Encryption Communication Security mode.
Reader
PICC
Command >
CID
$9
MAC1
MAC2
CRC1
CRC2
Echo Command >
CID
$9
ACK/NACK
STATUS
CRC1
CRC2
6.16.1. Operation
When a Write User Zone command is sent in Authentication Communication mode or Encryption Communication mode
the data received by the PICC is saved in a buffer until a cryptographic Checksum is received. The host uses the Send
Checksum command to transmit the Checksum it has computed. If the checksum is valid the PICC writes the data; if
the checksum is incorrect the data is discarded and the cryptographic engine is reset.
Only PICCs in the Active State are permitted to answer this command.
6.16.2. Command Field Description
CID:
The Card ID assigned by the ATTRIB command.
MAC:
The cryptographic checksum computed by the Host.
CRC:
Communication error detection bytes.
6.16.3. Response Field Descriptions
CID:
The PICC transmits its assigned card ID in the response.
ACK:
Acknowledge, the command executed correctly.
NACK:
Not Acknowledge, the command did not execute correctly.
STATUS: PICC status code.
CRC:
Communication error detection bytes.
59
5276C–RFID–3/09
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