AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

6.6. Write User Zone Command [$c3]

The Write User Zone command writes data into the currently selected User Zone. See Write User Zone (Large

Memory) command for the AT88SC6416CRF write command information.

Reader

PICC

Command >

PARAM =$00 >

CID

$3

PARAM

ADDR

“L”

DATA 1

DATA 2

……….

DATA “L”

DATA “L+1”

CRC1

CRC2

Echo Command >

CID

$3

ACK/NACK

STATUS

CRC1

CRC2

6.6.1. Operation

The Write User Zone command writes data in the device's currently selected User Zone. As each byte is clocked in to

the memory the lower bits of the address are internally incremented. The upper address bits are not incremented, so

the page address remains constant.

Write operations cannot cross page boundaries; a Write User Zone command can only write data bytes within a single

physical memory page. Attempts to write beyond the end of the page boundary will wrap to the beginning of the same

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

If Encryption Communication Security is active the DATA bytes are encrypted; no other bytes are encrypted. In the

Normal and Authentication Communication Security modes none of the bytes are encrypted.

The Write User Zone command includes an automatic data verification function when used on 88RF PICCs. After the

EEPROM write is complete the data verification logic reads the new EEPROM contents and compares it to the data

received in the Write User Zone command. If the data does not match then the PICC returns a NACK response with

$ED in the status byte. If the data matches, the PICC returns an ACK response.

30 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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