AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation
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AT88RF04C-MY1G Datasheet PDF : 158 Pages
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6.4.2.
Command Field Description
CID:
The Card ID assigned by the ATTRIB command.
PARAM: The PARAM byte is the ADDR H byte of Read User Zone (Large Memory) command.
Table 21. Definition of the PARAM (ADDR H) byte of the Read User Zone (Large Memory) command
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0
0
0
0
0
0
0
A8
ADDR:
The two byte starting address of the location to read.
L:
The number of bytes to read minus 1. L cannot exceed the size of the user zone.
Reading more than 64 bytes in a single operation is not recommended. In a typical application environment, optimal
transaction time is achieved by reading no more than 32 data bytes in a single operation.
CRC:
Communication error detection bytes.
6.4.3. 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.
DATA:
The data bytes read from user memory.
STATUS: PICC status code.
CRC:
Communication error detection bytes.
6.4.4. Error Handling
If a Read User Zone 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 22. Status Codes returned in the Read User Zone (Large Memory) response.
Error/Status Message
Status Code
No errors
$00
Access Denied (User Zone Not Set)
$99
Address Invalid
$A2
Length Invalid
$A3
Authentication or Encryption Activation Required
$A9
Password Required
$D9
Memory Access Error
$EE
Type
ACK
NACK
NACK
NACK
NACK
NACK
ACK/NACK
6.4.5. Notes
The Read User Zone (Large Memory) command is not supported by 88RF PICCs.
26 AT88SC0808/1616/3216/6416CRF, AT88RF04C
5276C–RFID–3/09
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